Oh I see, so you think EVERYTHING LGBTQ is "adult sexual matters".
Look, LGBTQ stuff is not inherently sexual or adult themed. There are things that are sexual and adult themed that just happened to be LGBTQ, just as they are straight/cis things that are adult themed and sexual. Not everything LGBTQ is sexual or adult themed.
And am pretty sure that children dont care about sexual orientation as far as they care about eating the cereal. If they see boxes like this they wont care about the color or the themes, they will just want the cereal.