I think he's probably off in the summer. Firstly because that interview and the press speculation feels like the early days of a transfer saga, and secondly because he looks the least settled of the front three right now and all three are coming up to two years left on their contracts. Giving a 29 year old a big, lengthy contract when their numbers have dropped for the last two years is something Arsenal would do, it's not something a well-run club does. And going by his body language, he doesn't look as relaxed as he did a couple of years ago, Perhaps he feels like he could do with a new challenge.
In a wider sense however, the club is going to have to make some tough decisions with contracts and sales soon. Virg, Fabinho, Hendo, Shaq, Keita, Ox and the front three are all coming up to two years left this summer, and all of them bar Keita are going to be around the 29-31 mark when their current contracts expire in 2023. An extension will take them to the 32-34 mark with sizeable wages and spiralling resale value.
You can't renew all of them, otherwise you're left with a team that's aged together, like Leeds in the mid-70's, us in the early 90's or the Mancs when Fergie left (or Barcelona last summer). And no matter how dominant a club are, a team in that bracket can fall off quickly if they rely on a lot of older players. That may be exacrebated considering the intense pressing style Klopp favours. I'm not saying Salah is out the door necessarily, but some players will be for sure and almost certainly at least one of the regular frontmen.
