Interesting... youre right that its been slightly enhanced. Definitely 'sharpen' tools used which is why the plant leaves behind him are also less blurry in the twitter version. They might have been a bit too heavy with the contrast/levels adjustment which is why the stripes on his shirt disappear.

They could also have used ai to do this. You can now use ai to do things like enhance/sharpen old photos and regain some of the pixels/details that have been lost in the process of scanning and then compressing to small jpg files.

But well spotted anon. The enhancement wasnt really necessary, but certainly doenst make him look younger than the original Time Magazine photo.