My take is that if CEO Vanis reviewed the letter before release, he definitely does not foresee the pps retracing any time soon. It appears the letter was emailed by Spellcom, not Vanis himself.
As far as Cramer endorsing Clay, I have not seen any DD on that subject, however, to use Clay's video, giving positive credit to Clay was a great idea.
I simply think the motive behind the letter is to bring to the forefront the up trending in PPS.
Remember this, unlike you and I, CEO Vanis can request and have at his disposal at any time a roster of all shareholders by Name, address, and current holdings. Clay may be a big investor, who knows.