I think anyone applying for DTV under "soft power" should confirm by email with the embassy prior to e-visa submission that in fact the chosen soft power activity will qualify. Unfortunately this DTV was very poorly conceived and now Thai immigration is trying to put the toothpaste back in the tube.
I have obtained 2 visas for my GF, she now has a 10 year multi-entry visa. Learned a lot from the forum, first visa app failed. After the failed attempt I wrote my MP and he provided a reference letter.