I think having the DX tends to lead a lot of people who are first diagnosed with it, into an obsession about it.
But yeah, tests online are somewhat... not up to date with the most recent criteria for the diagnosis. And i'm sure there are some out there really just not accurate at all.
But i think some of them can give great insight to yourself. I wouldn't take the results as 100% accurate in diagnosing though.

with the results of that test, there are some very weak spots, but very strong spots in it, which is something that commonly happens.. if you can, print out your answers to the questions, or maybe copy it all down on a few pieces of paper, and maybe show it to your T?