Neil, the literature on product contains an obvious error but also the owner is not being precise, so tricky…
The Anker website makes an impossible statement.

That is impossible. You cannot have 100W come in, power the hub and peripherals and still have 100W out.
The Amazon site is less incorrect, it doesn’t make this statement but a different statement.

This is more believable, it is stating the hub takes 20W. The implication is 20W just for the hub with nothing connected, and may drop if you connect items, but the drop would be device specific obviously. This matches the thread, 60W in, 40W out (60 - 20), so possibly the buyer did not read the Amazon listing fully where it clearly states 20W is consumed?
What if we take the latter, less incorrect statement, for the owner 60W charger is coming into hub but never more than 40W coming out which matches the statement. The laptop, if it is not working on 40W, probably may be of the type which will only accept 45W and therefore is the problem. So 60W charger may not work, but 100W charger should probably work. but then I see 100W doesn’t work?
I agree also the lack of precision in the words here don’t help. Logically if the laptop needs 45W then connecting a 100W charger into the hub will leave 80W max (less if peripherals) but still work as 80W > 45W. So I can see a 60W charger into hub (60 - 20 = 40 < 45) won’t power a 45W laptop but a 100W charger into hub (100 - 20 = 80 > 45) will power a 45W laptop.
So we need to know precisely what “works”.
At a minimum we have an owner who didn’t read the Amazon listing before purchase. It says 20W taken by hub so yes 60W in gives 40W out predictable, but 100W into hub should work.