This looks more like a how-to by @5triderofthenorth or @instructor144
One of the easiest and most gratifying restorations a person can do! About half my cast iron is salvaged, the rest was new.
A great YouTube channel for cast iron cookware, restoring, collecting, cleaning & cooking, is Cast Iron Cookware. The guy is incredible.
is that the reason that these oldschool pans never have a wooden handle? So you can treat them in the oven like this without destroying part of them?
Yes, thats why. Also so you can cook food in them in the oven or on an open fire without damage.
Always wipe clean with a wet rag or sponge after cooking, minimize scrubbing, simmer water in the pan to soften really stuck bits. Then dry fully and put just a smidge of your oil/fat of choice on it before putting the pan away. And liberally re-season (the coating with oil/fat and baking at 400 part) as needed if you notice things sticking more!
These pans will last multiple lifetimes, as evidenced by the video above.
This is always useful info. You never know when you’re going to come across a cast iron pot in need of a good home and some TLC.