Discard the positive reviews, most likely bots or Vestiaire workers, though I would be surprised if they can read or write.
Frankly as a seller, do not trust these crooks with your items, you can show every flaw and mention it, the quality of their experts is that they will not read your review or look at the pictures and claim your listing is not compliant.
When you have the direct sending, beware as tons of people then claim they have received something else or damage your item to force a return and Vestiaire will take their side. They lie to you that they will investigate, but the quality of their responses (not sure they are real people, it seems bots and they don't respond or respond to something else) is as poor as about everything else in that company.
Sell on eBay, sell on Vinted, sell on JoliCloset or any other website, but don't give Vestiaire a commission, unless you enjoy dealing with a bunch of inept and crooked "people".
As a buyer, how much do you trust an "expert" that can't read or write? Wouldn't be the first time they let fakes through or couldn't identify real items, just check out their reviews, you will find that the positive reviews are usually bland, most negative reviews give you information, don't rely on just this platform, check every other review platform, the fake praise reviews are the only reason why they aren't at the lowest level, at one point they were a company you could trust, it has changed, they are now a company who rips off buyers and sellers.
Oh and Vestiare, how nice of you to employ the illiterate, but hey, don't call them experts