It's a good thing you didn't mention the "sitter" he missed from 5 yards because then people would know you're just pushing a tired agenda and inventing instances of bad play from Rodri instead of acknowledging a brilliant save from a good header.
Everything about the header is textbook. He's a few yards outside the width of the goal, so you'd be an idiot for calling it "an absolute sitter" anyway, but he hits it well with good pace above the keepers head. Mendy makes an excellent reaction save.
Is it the perfect, unsaveable header? No, but trying to squeeze it in the near post from a tight angle is the wrong decision when back across goal with that much power is going to go in unless the keeper makes an incredible save and even then there's the chance of a rebound going in.
Great cross, great header, great save. Whining that he "missed" it is absolute nonsense and betrays an obvious bias.