A) is wrong - its not pointless, just insufficient. And, as such, will break down somewhere along the line, if the issue of racism isn't explicitly dealt with as well. It's like trying to unite Ireland by only mentioning bread and butter issues, and never ever mentioning the border. Wont work.
Where he is wrong is in calling it opportunism - unless he (Seymour) means that he doesn't believe Tsipras actually holds to such a crude belief as that Seymour assigns him, and is only saying he does because it will get him into office.