Jaguar implemented a fairly radical change to their product line, getting rid of all their existing cars, and announcing, but not actually releasing, a new car. As a result, they do not currently sell cars (which, ah, explains the drop in sales that the person you're replying to is going on about); they'll release a new car next month. This is a fairly extreme tactic, but honestly maybe better than just waiting to die, as they had previously been doing.
They also made an ad which a lot of the likes of Musk got very pissy about, for reasons I'm not entirely clear on. Some right wing internet weirdos have claimed that Jaguar's reduction in sales is due to the ad, as opposed to the fact that, just to reiterate, you cannot buy a new car from Jaguar today, because they no longer manufacture any of the cars that they used to sell. This is obviously an extremely stupid claim, but then "extremely stupid" is kinda the far-right twitterati's _thing_.