His site is "Fishing Minnesota ®" and that is what he is claiming is a 'registered trademark'. The positioning of the two words in that reverse order MAY be a copyrightable and/or a trademarkable phrase... but I doubt it. It certainly does not permit him to control the usage of "Minnesota fishing" anywhere and everywhere it might occur.
The use of a fictitious business name such as "Minnesota Fishing Company" gives the holder of that fictitious name the right to prevent OTHER businesses from using "Minnesota Fishing Company" but not any of the words or combinations of words that are not the complete business name, i.e. "Fishing", "Company", "Fishing Company" and "Minnesota Fishing" ARE NOT protected.
It had damned well BETTER be registered with the USPTO if he is using the (R) mark.
Otherwise, he needs to read about what is going to happen to him;
Hint:
He is going to be much too busy for a while to bother bullying people to try to monopolize a domain name.
Even if he has an application in, he cannot use that mark until the Trademark issues!
If that Registered Trademark does not show up on the USPTO database, forward it all to the USPTO and let them go after him for fraud.