Hi @Atlasvue
Hard to give a definitive answer as it really depends on the circs. If, for example, a new book is being promoted and the author's previous book was a bestseller, then clearly that will be liberally referred to in the promo for the new book because it'll make the new book more likely to sell (i.e. because the author has a proven track record).
If a company is launching a new variation of a well-established brand (e.g. Pepsi introducing Mango Pepsi) then the Pepsi brand is vital as it reassures the customer that the new, untried flavour is worth giving a go ("I know what Pepsi tastes like and I like it, so I might like it with mango").
Celebs can advertise and partner with loads of different brands but there's usually a through-line which makes sense against the celeb's particular personal brand and career track record e.g. George Clooney's face in a photoshoot will sell lots of Nespresso machines and Vuitton travel bags because we can credibly believe that Clooney is the sort of smooth, urbane type who has a Nespresso and Vuitton carri-on luggage.
So, references to previous track record makes sense, as long as that track record is good. And really good marketeers can twist this to their advantage even if a brand's previous track record is bad, as long as they're explicit about what they're doing differently this time to get it right. The best example of this is Skoda's genius brand re-launch.
What I've never seen is a mediocre celeb trying to launch a new brand on the weight of their previous, mediocre record. Despite what Sussex fans sometimes say, The Tig was not particularly successful. It wasn't huge, it wasn't a total flop, it was just meh. Not particularly exciting or groundbreaking, it was sort of like if an (even more) basic version of Carrie Bradshaw had a Live Journal blog.
The Tig brand is certainly not strong enough to sell As Ever. Possibly Meghan has fallen into the trap of believing the UK tabloids, who in 2017 falsely claimed (following the Palace PR machine) that The Tig was a roaring success.