It might be that they have to produce a review in order to get paid, but the game they have to review is in a pre release state.
If the developers say "ok, we know there are issues with the frame rate and the AI, BUT we are issuing a day one patch, so try to look past that." Then the reviewer is in a tricky position.
If they give a damning review they potentially spoil their relationship with the publisher. If the patch comes along and does fix everything then their audience accuse them of being shills or on the payroll of another publisher. If they delay their review they don't get paid / don't get clicks/ don't get noticed by the publisher / other publishers / lose status.
I can imagine that things got more complicated once games started getting patched, and particularly now that so many games are coming in hotter than ever. I don't know if we're seeing the results of the pandemic and lockdowns still or what.
The whole culture of gaming and the internet is about "now" and "first". To some degree, that's why releasing a broken game and fixing it later won't be enough, you never get a first time a second time.