@asahi himself says that the CDC’s figure is 90%, and says that that figure is wrong based on studies that aren’t actually about vaccine effectiveness. If you’re not going to accept the CDC’s numbers, then who will you accept?
And no, 90% is not the number for the original strain. That number was over 99%. The vaccines are, indeed, less effective against the delta strain, but they’re still really, really effective.
Yes, we should be taking other measures in addition to vaccines. But vaccines are still, by far, the most effective measure available. Discouraging vaccine use, as @asahi is doing, in order to encourage use of other measures is thus counterproductive.