As I mentioned on >>>/sudo/66101, I updated the code for super secure tripcodes because someone found it was excluding capital letters, thus making them less secure. I immediately changed the code on January 5, 2018. Because it wasn't really announced except on /sudo/, this might have caused some confusion. Sorry about that.
Regarding any Q posts that happened then, I can't verify anything because it seems the posts have been deleted. However, let's assume Q's post history wasn't the same. That does not necessarily mean his tripcode has been cracked. Q might have changed IPs, reset his connection, used cellular data, used a different VPN provider or even a different IP location from the same VPN provider - there are a number of reasons why a post history might start from scratch. Again, I cannot verify his posts because, well, they don't exist anymore.