Most all 50 amp cords are "Extension Cords" some have the matching plug and outlet some have a different Outlet (Marinco style) than the TT plug.
I used to have a 30 amp cord for use on 30 amp sites. it had a 50 amp Marinco Outlet and it was also a "Superflex" lighter weight jacket which did not get stiff when it got cold.. Very nice. But only 30 amp.. they make a 50 amp version too.
The one linked you will need to add the MARINCO outlet to it (The connector that "Pluggs into" the INLET on the RV)
https://www.rvupgradestore.com/surge-guard-replacement-electrical-flex-cord-p/50a15mose.htm
Home was where I park it. but alas the.
2005 Damon Intruder 377 Alas declared a total loss
after a semi "nicked" it. Still have the radios
Kenwood TS-2000, ICOM ID-5100, ID-51A+2, ID-880 REF030C most times