Only partially correct. The Seahawks can use the phrase "12th Man" but cannot use on social media or promotional material or merchandise. They were paying Texas A&M licensing rights to use "The 12th Man" but the agreement has been revised.

Texas A&M University has reached a new deal with the Seattle Seahawks to allow the NFL team to continue using the phrase "12th Man." There will be new restrictions on the use of the trademarked slogan, however. That's what the university declared on Thursday after announcing a licensing agreement with the Seattle Seahawks to allow the NFL team to continue to use the trademarked phrase, with some new restrictions. A&M owns the rights to the phrase, but it has licensed it to the Seahawks since 2006.

An extension of that deal was announced Thursday. But A&M officials said it added new stipulations to the contract. Now, the team won't be allowed to reference to the "12th Man" on its stadium's ring of honor, a displaythat recognizes great players in the team's history. The professional football team also won't reference the "12th man" on social media, according to A&M. (One apparent exception: The Seahawks did reference the tradition in announcing the new deal on social media.)

https://www.texastribune.org/2016/08...-man-social-m/