It didn't work for me. I have better Basta stats, and higher defense (21k), but I couldn't one-shot Veto even with Anti-magic activated just like you did. I had all the buffs, and it was perfect, it just didn't work out for me. He just heals so fast.
cleared this 2nd attempt only cause 1st attempt vetto decided to be a bitch and one tap my lotus lol. Appreciate the strat tho you saved me hours of suffering