It is nothing to do with print dying.
It has dropped off yes, but celeb mags, real life mags still sell by the bucket load. Angling times etc used to be huge sellers too.
And things like Private Eye, the Economist, National Geo still are very popular. And even in cars, some genres are well catered for like classic cars, road cars and special interest, so the interest in cars is there, just not an interest in weekly news and results. Amazed it lasted this long.
It is simply that there is no market now for a weekly racing news mag or paper, the content is always and readily available, results, pictures hours after the event.
They are all without a real purpose now, and really if you were buying them still it was likely habitual, like not wanting to miss anything.