Interesting question, an I genuinely don't have an answer.
That said, the way the online tests work, is they were implemented for 6-12 months without impact on interview invite decisions. Results of those tests were compared directly to candidate outcomes in interviews, and analytics were used to determine what characteristcs best indicate success.
So, CV screening has become more precise/accurate.
More or less strict? Depends on whether you're in their range of acceptance criteria or not :) As in...all things equal the same # of candidates get offered invites...whether you're in the same grouping then affects whether you view the screening as more or less strict :)