No. Logan and his brother aren't interested in fighting boxers. He's gonna fight one for the paycheck, but that's just because this one is very small, very old, very damaged with injuries, very past prime and Logan is dumb enough to believe that's significant in any way. He has no interest in getting in there with a decent sized young professional boxer. They're all about flexing and pretending they're tough guys. If you can pretend you're a tough guy without actually putting in the effort, why not? Why not beeing seen as a tough guy and getting paid a lot of money without actually doing shit? I'd take that opportunity too. Any poser would.
And to be fair here: he's gonna lose to Floyd, but even if he won, that wouldn't mean shit. We don't know how far off Floyd is from his prime. If he's only like 5% of what he was, plus 40 pounds lighter, there's a good chance that a big athletic dude with decent boxing technique could hurt him. Fighting is the most unpredictable sport of them all. All it takes is a touch. In soccer, you have to actually play better in order to win. In fighting, you can suck big time, being dominated in every way, and then land a punch.
The Floyd we saw against Conor was probably 25% of his prime self. He was slower, way less slick and his reflexes weren't nearly as good as they used to be. 4 years have passed since then. Put him in there with a low level boxer that is much bigger than him, much younger, much more aggressive, super hungry, willing to clinch a lot and play a bit dirty, and he might actually lose.