You are asking me to disregard heaps of peer reviewed research because you ran into a lazy retiree once.

So a retiree that doesn't work is now lazy? Does that mean by extension that a UBI recipient that doesn't work is also lazy?

Re. the pilot studies, I don't believe that the behavior elicited by a short term study automatically extends to a lifetime UBI.

As a counterexample I have suggested looking at pensioners, particularly healthy early retirees. If our working-age population experienced a fraction of the productivity loss that we see in healthy early retirees, we would not be able to fund our current expenses, such as healthcare, let alone a UBI on top of that.