That's part of it but it's actually more of a direct marketing effort than that.
With EV's the next new thing, it's difficult for many to get excited about buying a new ICE car. These ads get consumers excited about something new, EV's, which gets them thinking about how much down payment they have and how much they can afford monthly. It gets consumers thinking about a new car, even if it is an EV. If they can get them into one of their showrooms ready for a new car, it's a real letdown when they find out how far off a new car is. So, it's a simple "switcharoo" to get them into a brand-new ICE car to satisfy their desire for a new car. They will cite figures on how high resale value have been and tell them the first batch of EV's will be quite expensive and the prices will likely fall as EV's become more ubiquitous (OK, the car salesman is not going to use the "ubiquitous" word, but you get the idea).
The manufacturers know their dealers don't have any EV's on the lot to sell the EV curious and will "do the right thing" and get them into an ICE car. One more ICE car before EV's are "ready".
Get the mark ready to buy and slip them into a shiny new ICE car while making them feel smart for not jumping on the EV early-adopter bandwagon too soon. The charging networks are still being built out, the EV's aren't even ready yet, and will be expensive and somewhat unproven. Tesla are perpetually over-priced, so do the 'sensible' thing and slip into this shiny new ICE car with proven reliability and cost efficiency. They are just using the thought of EV's to get people mentally ready to buy a new car. This will work, right up until it won't anymore.