I looked through the link, while it was interesting it really did not answer or provide an answer of increased viral immunity to the flu vaccines, in the same respect as bacterial infections become more antibiotic resistant.

I do not believe the flu vaccine can cause an increased risk of contracting covid19, I do think a study needs to be done to determine if Viral infections are beginning to act like bacterial infections and becoming more resistant to the vaccines used to control them. The link mentioned nothing like that.

(hopefully this is not a double reply).