It’s not absurd. There’s a difference between “any appearance” and “any lasting appearance”. Anatomically modern humans, like other varities of homo sapiens, were great roamers. But whether the initial explorers were followed by enough of their kind to establish a lasting population is not a given.
The claims are modern humans established a lasting appearance in Australia 65,000 years ago, but did not establish a lasting appearance in Europe until 38,000 years ago. To make such a claim is absurd.
Europe is right next to Africa. Literally a few miles away.
Australia is about as far from Africa you can get, and still be on earth.
The claim is absurd.