As per https://github.com/Rdatatable/data.table/pull/5087#issuecomment-889401025 - [ ] use `nth` not `getDTthreads` on `#pragma` lines wherever possible - [ ] add appropriate `grep` to `CRAN_Release.cmd`
As per #5087 (comment)
nthnotgetDTthreadson#pragmalines wherever possiblegreptoCRAN_Release.cmd