Don’t think so, after having reviewed products there for many years. I generally do not provide them invoices although do on occassinon, and have never had a review blocked. Those who provide invoice copies have the review labeled as ‘verified customer’
If you do not provide an invoice the review shows as
and for a curiosity this reviewer has a single review on the site, glowing about AGL.
Could be fine, or could be a bot, but I wonder why would someone register to make a single glowing report. Not verified, either. OK, short time since 30 July, but scan reviews and you might get the point.