The question isn't "is anyone fooled by this anyway?", it's "why is Tesla using deceptive practices?". IMO, they should feel free to point out cost savings somewhere, but they should not fudge guestimated values into the first price they show you. It's not just tacky, it's bullshit. Energy cost and tax savings vary by region and based on your individual situation, your driving habits, etc. Tax refunds do not affect the cost you have to pay for a car upfront. Elon Musk is an engineer at heart, and I feel like he should know better. Doing things like this loses them the respect of a lot of people.
Tax refunds is money I'm definitely going to get back in a bounded (and reasonably short) amount of time. If I pay $40k for a car and get $7k back in the same year, it seems reasonable to advertise the cost as $33k (assuming it's clear that $7k of that is a tax refund).
But gas savings feels like bullshit -- it's money I may or may not get back (depending on my habits), the time horizon is unbounded, and even if it were bounded, it's long (an order of multiple years). That feels deceptive to me, and it's surprising they got away with it until now.
For example, if you buy the car in your name and then you lose your source of income (whatever reason, e.g. health, maternity/childcare) and for example you rely only on your spouse's income, I know at least one country where you can't pass the tax benefits to the other person (not even by transferring ownership of the car)
Somehow I suspect that they'll keep doing it in every country that hasn't told them to stop.
Theres a further complication in that most countries offer incentives for buying EVs, so you could legitimately think its one of those that Tesla is helpful illustrating for you.
Finally Europe has decent consumer protections, so the price advertised should be the price payable, and people expect that.