FYI, he forgot the last part:

"Moreover, the paper was released in 2021, and some of its assumptions are no longer true, particularly these two: “the route to the destination in LN is constructed solely by the payment sender [and all] clients generally aim to find the shortest path in the network.” (page 11)

Since that time, rendezvous routing has become very common: the latest versions of lnd do it via the Blinded Routes flag, CLN and Eclair do it via bolt12, and anyone with a “legacy” lightning wallet can do it via lnproxy. Thanks to rendezvous routing, there are many cases today where the sender no longer picks the shortest path to the destination; indeed, when rendezvous routing is used, he does not know the destination. So the attacks outlined in this paper simply wouldn’t work today in many cases, due to the assumptions being wrong."