Modern multitools like this one are more than 20 years old, so I don't see how there could be active multitool patents this would invalidate. Unless they did something especially clever in their design that would be specially patented?
But what is undeniably true, is that whoever got the money from patented multi-tools since the collapse of the Roman Empire was a THEIF and a PIRATE. The original "IP" belongs to somebody else! And they deserve their money!
I call for an international inquiry from the WIPO to determine who actually invented the multi-tool. After that, it should be a simple matter to determine heirs, get today's multi-tool PIRATES to disgorage funds, and award that money to the legitimate IP owners.