... mythology and disinformation that stems from incorrect statements in various early paperweight books ...
Actually goes further back than that.
One book I happen to have in front of me, published 1916, is Collecting Old Glass, English and Irish
by J. H. Yoxall. In Chapter V "Old Coloured Glass", there is a photo of a Dump, probably around 5 inch height, with two layers of flower petals over a fairly high pot (all of the "chalk bubble" type) and a "crown" paperweight. The photo caption states "Bristol Coloured Paper-Weights" for what we now know to be a Dump more likely to be northern English and the weight probably a good 19th century St Louis.
The text also says of the Dump, "... inner decoration ..., pearled over as if by dew, and blown with extraordinary skill". Extreme skill indeed - since no blowing was used! However, perhaps "blown" was also used back in those days just as generally as "Bristol" for so many glass items.
(Also, on the facing page there is a photo of a millefiori "pepper box", also stated to be made at Bristol, but which could be even rarer than the author claimed as it looks to me like it might be very early Bohemian!)