Looks like Eternabond tape to me and it’s usually used for serious problems. Been on this site for 9 years now and have never seen that kind of repair and a sloppy one at that.
I've thought about eternabonding my roof vents and skylights on my trailer, but then I thought if I sell my RV down the road is someone going to suspect an issue and walk away, when I was just doing preventative maintenance?
There doesn't appear to be any damage from the pics you posted, so just inquire about it.
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2015 Jayco WhiteHawk 28BHKS Summit Edition
2021 Ford F-150, 4x4, 3.5L Ecoboost, Max Tow