The easiest way to see would be to compare his model to another one. Money Pick has STL finishing with 81.9 pts compared to Doms 83.4. Doms numbers are down for playoff percentage, compared to money puck which has 23.6% chance to make it, 6.9% 3rd place and 7.1% WC. Although a better team for this is Vancouver money pick has them at 75pts vs Doms 85. Sabres are 84 on money puck against Doms 79. All models are different, I don't think Dom thumbs his scale or whatever. I just think he rounds the %'s and leaves out chances below X amount. Another thing is how convincingly the blues won vs lost could scew the adjustments.
Comparing points is irrelevant when discussing playoff percentage, it's a totally different measure. And setting aside that he is well below everyone in that measure, the math doesn't seem to add up.