The first I had heard about him was after winning 2019 Algarve and immediately recall thinking, rather intuitively, hmm, perhaps Evenepoel isn't the only lad about to cause a cycling earthquake. Then after California and, above all, the Vuelta, you could sense something was about to explode. The problem was, unlike Evenepoel, Tadej was not hyped as the next Merckx coming out of juniors and, not being Belgian, didn't garnish the international media attention of the cycling world. Nor did he yet discomfort Bernal as he eventually did. Neither was he the "flashy" swashbuckler of a MvDP, the 2.1 versione of Alaphilippe.
Then the bomb blew up at the 2020 Tour and it was of nuclear magnitude, whilst the Belgian, after a string of dominant stage race performances, albiet of decidedly less prestige, suddenly wound up in hospital with a broken pelvis from a dreadful fall at Lombardia. Still, Pogacar, given the feat he pulled off, didn't become as popular as one might have imagined. True, many didn't see it coming, many more may have felt envy towards him, the Roglic and Evenepoel fans first and foremost probably.
Even now, despite going on to Hinaultesque hights, he still remains less talked about than others. Had social media been around in Hinault's day, I bet the Frenchman would have been the most remarked about cyclist in the peleton, whereas Tadej simply is not. His nationality I think can only partially explain things. It's almost as if there is a large segment of casual cycling fans who haven't come to terms with the nature of the phenomenon or simply aren't willing to yet.
A foresee two possible future scenarios: either a worthy young challenger comes along to invite more discussion around him or else he continues to sweep up the floor and out of sheer amazement gains in popularity.