Re: Promiseland
Whether or not they qualify as a 'found family' is definitely more arguable than anything else, but I'd personally argue that it doesn't... matter...? It's not a 'found family' story, and that's I think what some Internet People™ need to realise, is that a story can feature tropes without it being about those tropes.
If they are a found family, like I said, it's an extremely dysfunctional one, and we could also discuss about whether that's Needed Representation or if it disqualifies them from the trope. Personally I just think they're coworkers who've lived in an enclosed space together with each other and no one else for several years. It doesn't need to be any deeper than that, and trying to force them into a family dynamic cheapens the trope
Which is to say: yes. It's arguably inaccurate and definitely useless as a descriptor and "found family" might need to go on the high shelf for a while.
sometimes a family is a man and the grotesque horse monster he finds in the vents and that's okay