Unless Liquid Glass has changed their formula over the years, I'd say it is just OLD Tech from waaaaay back. I tried LG back in the 1980s on the hood of a vehicle and compared it to other popular products.
I did(my own) controlled test by taping off sections of the hood and labeling the areas with the names of each products. I could hardly tell any difference between any of the wax/silicone products as-far-as shine/gloss improvement, ease of use(applying/removing), water beading & longevity.
Liquid Glass was about $18+ back in the 80s and about the same price even today. Meaning IMO, it's overpriced compared to newer products today, which seem to score higher than LG, by the professional testers. LG may have been the ticket in the 1960s & 70s but today, it's just an also ran.
Blue Coral for example,(not the new stuff) back in the day was also held in high regard but, that old stuff wouldn't hold a candle to today's products in ease of use alone.
BC was a tough product to remove and they(BC) only recommended putting on & removing a 1ft X 1ft area at a time otherwise it was staying there on your paint.
I remember in the early 70s, one detailer friend of mine had mentioned..."if you don't remove this stuff right away, you'd have to remove BC with a sander"!