If you refer to the 2016 u20 tournament, I'll be honest and say that I don't remember the FIN-CZE game. Finland's u20 success really started during the 2014 final win over Sweden.
He's referring to the 2014 U20 QF game. (Radek Faksa was born in 1994, so he couldn't have been a part of the 2016 U20 games.) Czechia led 3-1 about halfway through, but Finland rallied to take a 3-4 lead in early third and potted an empty netter for a 3-5 win.
It was not quite a decade since Finland's last medal, though, as the previous one was a bronze from 2006. That team was already a part of the "lost generation" of 1985-1991, but it had Tuukka Rask, who practically dragged Finland to that medal all by himself.
What is pretty crazy, though, is that Czechia's last medal on the U20 level is a bronze from 2005 - their dry spell has lasted since then. And they also have only one QF win on their belt since then, from 2018.
We know about the 2016's famous roster but the 2014 team also had some good ones. It had Teuvo Teräväinen, Ristolainen, Juuse Saros, Husso (St. Louis back up goalie), Esa Lindell, Artturi Lehkonen, Mikko Lehtonen, Julius Honka and most interestingly from the current 2021 WHC team that team also had Ville Pokka and Saku Mäenalanen.
While the 2016 team is remembered for its insanely stacked offense, that 2014 gold-winning squad's back end was perhaps the best we've ever iced on U20 level. Saros and Husso as goalies, with Ristolainen, Lindell, Lehtonen, Pokka and Honka playing key minutes in defense. Even Juuso Vainio turned out to be a decent euro level stay-at-home D. Only player out of that seven whose adult career hasn't quite panned out is Mikko Vainonen.
Yet it is remembered as something of a surprise winner, mostly because the offense was quite sorry-looking outside of the first line of Mäenalanen-Teräväinen-Haapala. In retrospect, Artturi Lehkonen, Juuso Ikonen and Ville Leskinen have also turned out okay.