They've covered this entire generation of games, if your 480 or so streamed games are not part of the data that would be crucial to make a difference to these stats then that says more about the state of PS Now than anything else
Copying from Era, some of the games on PSNow that aren't factoring into their rating, not sure how omitting these says anything about the state of PS+ and not of Opencritic's tweeting
You can't tell me any of these aren't 'crucial' games. They're more crucial than Guacamolee 2 and two separate entries of Hollow Knight
Arkham Asylum
Arkham City
Bionic Commando Rearmed
Braid
Bioshock
Bioshock 2
Bioshock Infinite
Dishonored
God of War HD
God of War 2 HD
God of War Chains of Olympus
God of War Ghost of Sparta
The OC tweet doesn't specify any gens and is trying to create a blanket picture but it's pretty inaccurate
If they had said 'for new released games' then sure.