Platform: PC
Language: English
Version: 1.61.15.1020
Expansions installed: Get Famous, Cats & Dogs, Get To Work, Realm of Magic, Jungle Adventure, Outdoor Retreat, Movie Hangout Stuff and Holiday Celebration Pack
Custom Content: SimulationLagFix and MCCC.
Mentioned a problem like this in a Sims discord and was asked to leave a 'me too.' I'll also leave a bit more info here.
Upon further inspection of several of my sims, a few of which have all the traits that satisfaction points can buy, I saw that this tooltip issue seems to consistently affect the following traits:
Gym Rat
Steel Bladder
Antiseptic
Fertile
Hardly Hungry
Seldom Sleepy
Forever Fresh
Forever Full
Never Weary
The 'not available for robots' shows up on Sims that already have these traits (but have enough points to buy them if they didn't already have the trait). For example, one of my Sims has Never Weary but does not currently have 10,000 points. For them, it simply says 'insufficient points.' But on another sim who has Never Weary and DOES have 10,000 points, it gives the 'not available for robots' tooltip.
Unknown whether this happened before or after a specific patch, because I only first noticed it in a house that I hadn't played directly in several months. I do know that I got Get Famous, Realm of Magic and Movie Night Stuff in the time since I last played that particular household, though.
This bug does not appear to be preventing the buying of traits, in my case. Looks like a few other folks on here have an issue where they don't have the trait but also can't buy it, which is definitely bad.