Yeee.... Kind of. The ones at the larger publications know their stuff. The internet ones (Collider, etc.) you could make a decent argument that you're correct.
This is becoming an issue and the general public doesn't know/can't comment on just how much Disney is aggressively flexing its power within the industry or how exactly those machinations play out. It really is unprecedented. The power of Disney in the past eighteen months has grown enough that it is definitely reasonable to assume that almost every indie/low-level critic with their livelihood on the line will have serious second thoughts about offering anything but praise for anything coming out of the studio, not just because 'it's Disney' but also because you're talking about the director, the stars, and most importantly their agencies. Disney is in a somewhat unprecedented position to be able to leverage that against any dissenting voices. Not that they weren't before, but their position has become much stronger.
It hasn't gone unnoticed that even slightly 'negative' TLJ reviews came from mostly protected critics at rival corporations (CNN, etc.)
That being said, it's not at the point where these people will so pressured as to de facto offer a positive review for fear of being blacklisted.
But you're right to make note of it as it's definitely a thing and going forward it will become very real; it first came to notice after Beauty and the Beast early this year, where a lot of critics just gave up comparing it to the excellent original and essentially saying 'it's great for what it is.'
The TLJ critic's positive consensus thing is probably largely the same thing that happened after TFA, where everyone was just falling over themselves to praise it and then after the dust had settled they actually realized it was poorly constructed/executed. Basically everyone is hedging and not wanting to step forward as a likely lone voice of dissension during the immediate post-release afterglow.