Hello,
basically, I agree with the statements here that urge increased caution.
At first, it doesn't really matter whether this is a BT, a GÜ, or a GU.
If the company in question "goes down the drain," a lot of extra work, stress, delays, and financial expenses are inevitable. Not to mention possible warranty claims that may no longer be enforceable.
A bank will not do the devil's work by issuing unfounded warnings!
In your position, I would be grateful to the bank for pointing out a circumstance that might have otherwise escaped your attention.
Have you already checked whether the company in question possibly also maintains accounts with this bank – that could, for example, be a reason why one bank knows more than another and can only tell you this indirectly or "between the lines"...
As already said, examine the background of the company thoroughly – if in doubt, seek professional help.
If (justified) doubts still remain, I personally would look for another company.
The risk would then be too great for me.
Regards,
Dirk