I don't quite understand why a military tank would suddenly raise the game's rating now. Is it like a new gun situation where ratings get freaked out over the fact that they exist? This is like the presence of fighter jets now raising the age as well. I also read that it caused a big explosion and I'm like...so what? 8 year olds will love that, look at cartoons aimed at boys in the 80's-90's like Transformers or GI Joe. I'll never get why Odyssey gets an E10+, I don't think it's unsuitable for 6 year olds in the slightest.
What's funny is that zombie Mario with an axe on his head was added post-launch.
I think Yoshi's Crafted World can get away with that because everything is made out of craft rather than realistic. I'm going to bet if they used ketchup, red paint, or tomato sauce as blood, it will still keep the the E rating.