The original question was about validity or not of chasing (not S2S) using a remote station and that’s been clearly answered by Brian in behalf of the SOTA MT.
Regarding the quoted sentence, I see it off topic but I think it’s not well worded, as I may go to the summit with friends and they may be carrying part or all the equipment to the summit for me. In that case, all the equipment will have not been carried by me to the summit, but I understand it should be 100% valid no matter how many friends or goats I used to carry the equiment to the summit for me.
In my opinion, rather than current vaguities about the use of vehicles to get to the summit, it would be much better writing things clearly about how an activator can get to the summit the way he/she wants/can but stating that the activation will only be valid for SOTA as long as the radio station, including the operator, remains away and fully independent mechanical and electrically of any motor vehicle at all times during the activation, as well as of any mains or motor based portable power sources.
But this has been discussed in other threads and there it should continue in case it does.