The sextillion things need to be updated onto the blog. I'll just elaborate on how it works for now tho since it's late for me. When Sonic gets stronger and faster, Super Sonic receives the same benefits. As an example, in Frontiers, when you upgrade Sonic's attack stat to max, he gets 4x stronger. Super Sonic likewise gets 4x stronger. The biggest spurt of growth we get is Classic Sonic (Who is listed as Dwarf/Small Star level or smth? I can't remember) jumps to Multi-Solar+. The jump between those tiers is massive. By Frontiers, Sonic is sextillions of times stronger IIRC. Thus the sextillions of times above Baseline 2-A in Sonic.
And the attack in the videos you sent start as an EASILY avoidable beam. And only becomes a AoE dome after being fired as a rainbow (And I thought they couldn't get anymore corny..). Escaping the blast, AoE, and blitzing is VERY easy with a 346x speed amp. Like, seriously, they start 10 meters apart. The time it takes the beam to cross 1 meter, Sonic can cross 346 meters. Let alone 10. Sonic weaves around the attack, tramples Twilight with thousands upon thousands of attacks (That hit her across all of time simultaneously), and simply evades if the attack comes back to home in on him (If she even survives being barraged by so many attacks).