Minimize raises the user's evasion by two stages. In addition, Pokémon that have used Minimize will receive double damage from Steamroller.
So Minimise only doubles the damage from Stomp, regardless of how many times you use it.
The base power of Stomp is doubled to 130 if the target has used Minimize.
That's the BP of Stomp under Minimise's effect. Blitzle's hase a base attack stat of 60. Its attack at level 1 is at a maximum of 7; even at LC stage, its attack is at a maximum of 16. It also receives no STAB from Stomp.
Muk's lowest HP & defence at level 100 is 320 and 139 respectively.
I'd add some maths, but I don't think I need to deal with any more numbers to show that Blitzle will have its horseshoes fall off before Stomp KO'd a Muk.