I don’t think that is true. I think it all depends on the mold manufacturer in whichever country you are in.
In my 20+ years of wearing BTE aids with silicon molds, most of them have had tubes with either brass or plastic locks on them, from the manufacturer.
Because of the shape of my ears, I cannot pull my HA’s out by the tubes anyway, they need to be rotated in/out via the mold.
But I find that the tubes with lock on them seal better than without or with being glue in. I hate them being glued in, the tubes deteriorate much faster inside the molds.