Thanks for the comment!

I explain poorly.

The Tor Browser has this setting to redirect/ prioritize clearweb urls to onion urls.

When used in the Tor browser, I can access reddit with it’s clearweb site (.com) and (with the “prioritize Tor sites” turned on) the url showing it as onion site (.onion).

Hope I understand it right and with the setting turned on, tor indeed “magically makes clear web site to an onion site”.

Not Tor-expert, hope I get this right. :)