How many parts have you personally ordered from Partsouq?UAE is the global center of fake Toyota parts. There's tremendous demand there for Toyota parts, and UAE customs has not been on the ball in catching imports of fakes.
Some people have liked the stuff they've bought from Partsouq and similar UAE-based vendors of purported Toyota parts. My personal guess (only a guess) is that the parts in question are fakes made to a decent quality standard. The market for actual Toyota parts distribution is quite tightly controlled in the UAE.
My opinion is that the Partsouq stuff is not real Toyota, but it might very well be of very similar quality.
See e.g. Huge haul of fake car parts bound for Australia seized in Middle East - https://www.smh.com.au/national/huge-haul-of-fake-car-parts-bound-for-australia-seized-in-middle-east-20170113-gtr15a.html
Just because some fake parts are sourced from UAE and Partsouq is based in UAE does not make them any more/less likely to be selling counterfeit parts.
I've ordered a lot from Partsouq in the last few months. Everything has been genuine, far as I can tell. To someone else's point, they sell everything - not just a selection of what could easily be faked (filters, gaskets, other common parts). Between just a few of us on this board, we've probably ordered and closely inspected tens of thousands of dollars of Partsouq parts, none of which have been noted as seemingly fake.
I'd be extremely shocked if Partsouq made a habit of selling fake Toyota/Lexus parts.