I see it the same way .. 0.2 ... the 0.15 is only an example value in the legend to define the floor area ratio.
... it would be easier if you only address replies and also collect them in one post instead of creating a full quote for each post and adding a short sentence.
And ... that’s the catch .. some information somewhere in between. That’s why this checklist post was developed and also pinned at the top in the forum section, which you also found. Unfortunately, many users don’t quite master the usual netiquette rules of forums.