That is two Rib eye steaks coated in kosher salt. Kosher salt is not as fine as table salt. Table salt would probably just disappear Dry Brining is a process of tenderizing steak. It really works well and I hear you can use this process to make cheap cuts into more choice cuts. Basically you do this on one side of a steak for 1 hour per inch.
Oh yes of course you can wash off all that salt before cooking. Just remember to dry your steak really well before searing any steak.
To see this process in action check out Jakatak69’s youtube video for more info.