I think the point was that the claims of improvement are not specified and there is no way to find out short of buying, installing and testing on your own.

I also strongly suspect that there is way too much before/after claims made with the before being a wore out unrebuilt 50 year old factory installed suspension against a new aftermarket one. Well duh there will be an improvement.

Reminds me of an aftermarket cylinder head manufacturer we all know that claimed in magazine ads years ago a large HP increase over factory heads.

In the fine print you found out that the factory heads were stock 305 heads and they were tested on a 350. No [censored] the aftermarket head was an improvement on a 350, you were choking it with the 305 heads. Technically, and probably legally, a factual claim but not accurate. But at least they put it in the fine print. Same can't be said about a lot of aftermarket manufacturers.

They say there are no such thing as a stupid question.
They say there is always the exception that proves the rule.
Don't be the exception.