Few enough people use it i doubt they'll do that. The og reddit api (is that the term?) that came before old.reddit still works too (can't remember what it is off the top)
I was going to suggest otherwise, but after checking the viewing stats on r/linuxhardware, out of 193k unique views in July, 7,300 were from old.reddit, which accounts for 2.8%, and that kinda blows my mind. Just a couple years ago the numbers were much higher.
The views on that sub have increased a lot over the last year, but engagement is the same or lower, so I heavily suspect a lot of the views there are just bots inflating the numbers.