No, that's wrong. If ever miner licensed the optimization and so was able to mine 25% cheaper, all that would happen is that the difficulty rises 25%. Everyone ends up mining the same number of coins, and the patent troll collects his 5% tax from every miner.
And this is different from bying more efficient ASIC hardware ...how?
This is different than buying more efficient hardware because I am free to buy the hardware from any vendor I like, or create my own. There's no law telling me that if I want to use the more efficient mining algorithm I need to gain permission from a particular person.
BTW, you don't understand what a patent troll is. For starters, it is not the actual author of a work/inventor.
"a patent troll is a person or company that attempts to enforce patent rights against accused infringers far beyond the patent's actual value or contribution to the prior art"
In this case the idea being patented is the that of not repeating the same calculation multiple times. It's hardly a novel idea. Requiring a licence before allowing people to omit repeating the same calculation multiple times isn't right.