There is an announcement at the top of the instruction forums that states the policy:
|Members are cautioned that branded words, people, and concepts are admissible so long as mentioning them isn't the reason for the post, or of a repetitive nature which we would define as marketing. Posts or links designed to generate revenue from any skiing related activity—the promotion or sale of merchandise, instruction, travel, etc., are treated as affiliate relationships and we will negotiate them case-by-case. Members are encouraged to use their own words and experience to communicate, using links to images and off-site resources in the public domain as needed to support their personal ideas, theories and opinions.
As you can see, there is no specific ban on PMTS, although this policy did grow out of a perception that that teaching system, books, DVDs and related materials were being disproportionately promoted on this site. Considering the volatility of this discussion last summer,
its hard to imagine how you missed it. Do a site search on the subject and tell me if you think its banned.