Yes, Astralis peak >> Heroic. However, 2018 Navi only had s1mple + electronic hard carrying. 2021 Navi can have s1mp + elec + b1t + perfecto carrying. That's a whole new level compared to 2018 Navi, even if electronic is not that good anymore.
If 2018 Navi could win 4 LANs, make 10 LAN GrandFinals, even against Prime Astralis of 2018, 2021 Navi is better than 2018 one. The team is balanced now. Also, motivated Zeus showed up in like 1 out of 50 games, so, let's not get into that.