Right to information from the notary even after purchase?

More understandable than just wrote, you won't get it. You also notice that we are all writing in this direction.

Now you have to weigh for yourself whether the amount in dispute and your satisfaction of legal understanding are worth it. As soon as the payment order is issued, you will have to respond in one direction (lawyer) or the other (pay).

Either way, the situation will be resolved faster than you would like.

You can object to a payment order by ticking the box on the form. After that, there is either a lawsuit or nothing further.

How do the other builders deal with it, if some have even already been summoned by the building authority? Do people give in, or does it make sense for you to get together? Local newspaper?

If it is really the case that the purchase only meant the development up to the property boundary, then who gives the municipality the right to commission any company for the house connection? In that case, the builder alone would indeed be responsible for it.

And even if the municipality always does it this way, i.e. commissions the same company and handles the house connection directly, which can also be advantageous, this must still be agreed upon with the builder.

Otherwise, I see it like the others. Present it to the lawyer, he can clarify it exactly. It is understandable that you possibly want to clarify this without a lawyer and costs, but it just looks like that is not going to work.

The thread developed exactly as expected despite the rephrased question, just like your original thread some time ago. Even back then, everyone unanimously advised seeing a lawyer. I absolutely don’t understand why this is starting all over again here and why you haven’t been to a lawyer. Apart from a warning, the situation is identical, everything is repeating itself. Please just simply go to a lawyer, within 30-60 minutes sitting at the table you will have all the important questions answered...

Hello,
I also first thought that you were right. But then after reading carefully again:

Quick explanation:
The line goes from the branch point to the main shut-off device (first on the property) to the transfer point (first in the building).
From the branch to the main shut-off belongs to the municipality and is paid for.
From the main shut-off to the transfer point (the 10m) is yours and will be charged to you.

At least that’s how I read it, it is just a personal opinion and not legal advice. If you want to know exactly, go to a lawyer.
Btw, that’s how I know it too and it is the normal case. Between the main shut-off and the transfer point is on the builder’s side and is usually also awarded and billed that way. Maybe there is still a legal loophole here since you did not commission that part and it was awarded by the municipality. But surely there will also be something about this in the fine print.

The line goes from the branch point to the main shut-off device (first on the property) to the transfer point (first in the building). From the branch to the main shut-off belongs to the municipality and is paid for. From the main shut-off to the transfer point (the 10m) is yours and will be charged to you.

As the OP already explained in his first thread on the topic, the matter is a bit more complicated:

Of a total connection length of 18.7 meters, 8.7 meters are billed. So just under €190 per running meter. Upon inquiry, both the municipality and the company explained that "this is handled here" such that everything from 10 meters on must be paid by the owner.

By the way, that's how I know it as well and it is the standard case

Yes; but here this is not the standard case. Because the municipality or the construction company also consider part of the service as compensated.