Just because a residential community is not accessible to everyone, does not make Wayspots in the area ineligible. The area appears to be a complex of houseboats. Is that correct? If it is, it’s not a single-family private residence and should be treated like an apartment complex. While the complex might limit access to residents and guests of residents only, it is still accessible by members of the public.
Is the pin placement incorrect? If not then I don’t think this applies for the reason I stated above. From the pictures provided in the thread you referenced: Poi removed incorrectly it appears to be outside the office for the complex of house-boats.
The “collective group” would be the people who live there, and as the location is publically accessible (at least to those who live there) Niantic has said on past occasions that these locations are eligible. Similar to gated communities, or amusement parks/water parks where you need a ticket to access it.
Niantic can weigh in, however I would venture to say that given they restored the Wayspot once I’d imagine it’ll stay. Then again, they also removed it once so…