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Sep 13, 2022 at 7:42 comment added user93353 yes, I got that from your reply itself - your reply was very clear.
Sep 13, 2022 at 7:22 comment added fgrieu @user93353: yes. The problem is that this optimization can break down when $P$ is extracted from an alleged signature, and is not actually equal to something of the form $[j]G$ where $G$ is the generator point, and as should be verified somehow before making said optimization.
Sep 13, 2022 at 0:40 vote accept user93353
Sep 12, 2022 at 4:39 comment added user93353 Very ambigous statement by the author! But yeah, reducing the scalar by $\bmod q$ is a valid optimization.
Sep 12, 2022 at 4:30 history answered fgrieu CC BY-SA 4.0