Have you checked the GUI DDOS statistics or if the same messages are in /var/log/dosl7?
https://support.f5.com/csp/article/K45156590
If you have removed the logging profile for https-vs you may check if this VIP is created by an iApp or it has a an irule that could generate such logs or something else?
You may raise a case to the vendor as it could be a bug. The log level "info tmm[14479]: " but the tmm logs are set to notice and this is the strange thing.
Other think is to test seting the ASM log log.ts.level to Notice level from th GUI or CLI just as a test.
That are my ideas.