I think PQ was more talking about how there could be a fight going on, and you pull your pak forward into the fight, then cloak it and let it hit a tank. It cloaks even if there are units in sight range, or are firing at it. Most players do this, kinda have to to make the pak do much damage. Same thing the m18 does, drives up, disappears, you go OH SHII and bam your tank just took it in the face.
Doesn't bother me much though, because both sides can do that with their cloaking units.
That exactly what they do with the m18 hellcat super cloack on half helth hit a hetzers in its front armour ambush abuility.
It rolls up on your tank, cloakes, and BOOM.
Except the Hellcat bing a tank, lets it do it alot easier than if a pak tries to do it on you.