The article makes the assumption that
a) One cannot be for "take a knee" and also for specific policies in terms of CJR. Taking a knee is a powerful sign of solidarity, especially when used by police officers (double points if they don't start tear gassing people after they stand up).
b) Kaep's protest was about, or did disrespect the flag, which it absolutely did not. You can be of the opinion that it did, but your opinion wouldn't be shared by the people who actually participated in the protest. If you want to boycott the NFL over some players protesting police brutality, you can leave in my book.
MY quarterback believes that Black Lives Matter. MY quarterback also believes in solidarity and racial justice.
My quarterback also happens to be the best in the world and a champion, so that helps too.