This is a very thorough breakdown of their grant distribution. It sounds like they have changed their execution plan without consulting the Optimism DAO (or so much as posting an update on this governance forum, at least that I could find).
However your post here will not be recorded unless you submit this evidence as a Grant Misuse Report, so that it can be independently verified by the NumbaNERDs.
While this report is for a grant that falls outside the liveness period (one year), having an official report for posterity will help the DAO make better decisions going forward.