It's actually slower than the current requirement, but does require you to get up to speed faster.Maybe my test was full of particularly fit people but most were well under 6 with some even trying to manage under 5. Doesn't seem necessarily a super high bar. Only person who didn't manage because they pulled a hammy
Every test I have attended I've seen folks sail very close to the wind (either late to the line or leaving the line early) yet never seen a person fail.
I don't think the failure rate will be as high as expected but there will be some disappointed people on the test days