I know what you mean.
I sense that Selmar uses his past connection with the HMN to the hilt in order to get inside the front door of many of these chateaux - do you think that he might also use FRK's IG repeated conversational piece, "as featured on C4 CDIY" within his initial application/approach? 100% think so.
Once arrived, comes across as a quietly spoken, harmless, free spirited, travelling vagabond accompanied by Diesel - think additional brownie points on that score - in his camper van willing to do any odd jobs when/where needed as a "workaway" volunteer.
I actually found his comments in his previous vlog to a current workaway volunteer who was cooking lunch at this new chateau rather condescending. My instant thought would have been if I was that volunteer, "well, who the F do you think you are matey - obviously, no better than me otherwise why would you be here?".
Does he really work 5 hours a day at any of the chateaux he visits? I am doubtful as from his vlogs it appears that he feels he is always doing the owners a favour by highlighting their properties even though, ordinarily, you can't understand most of what he says between his inappropriate laughter.
So, he feels, that the owners should be grateful that he is there and therefore he ultimately gets out of doing any real work, maybe?
Has he actually done any "volunteer" work at Chateau de la Bastille yet? Nothing in filmed footage as evidence to date.
IMHO, just another grifter - end of story.
But, filming content for his YT channel throughout is paramount of course, which, at the end of the day, is financially beneficial to him - not the owners. Correct?
TBH, if I were Grant/Emma, I would 100% start vlogging their own future Chateau journey. They have owned it for at least 2 years so the time is right. They seem like a really lovely, genuine, hard working couple/family at the moment - perhaps until they jump on the bandwagon in creating a Patreon account perhaps! For the love of God, please don't.