When I looked at his games, I saw none at all played on the 17th.

I think you should take another look at the numbers and see if you get the same result.
It is possible that something is broken.
In general, if you find a bug, use the bug report tool to let the developers know. (It is on the bottom left Help menu on the website.)

Hi Chess

Team,
How is the player's score 605 for the current week when he has only won one rapid game since the start of the week (17 July 2023) and shows zero count for blitz and bullet. Is the scoring broken?