既然否定词加比较级等于最高级 ，那如何理解no less than？
No one tries harder than the jobless to find silver linings in this disaster
这里就表示的是hardest
而no …less than确表示的是和…一样
明明都是否定词加比较级 英语渣表示有点懵
(Source: Zhihu)
(answered by: alexcwlin; edited by: Adam Lam)

You are correct in saying that “no one tries harder” means “trying the hardest” to a superlative degree.

Marketers often say “No one tries harder than us to serve you” to mean “We try the hardest to serve you”.

Another example is “No one is richer than Bill Gate in this world”.

The ex*pression “no less than” usually comes with a number.

For example, when you say “No less than 20 people showed up in the meeting”, you usually mean 20 or a few more than 20 showed up. Although “a million” logically is not less than 20 but that could not be what you would imply.

If you want to imply a superlative degree using “no less than”, you would say “no less than 100%”, which does not make sense because you would have simply said “100%”.

I hope the above explanations help to revolve your puzzle.