Bruh! Does it matter if a sensible thought comes from a high scool kid or a parrot, as long as it is sensible?
I think the display of lessons shows a lack of experience in understanding software project management, which isn't surprising if they are a high schooler.
Nice Ad Homenim argument you've got there -- criticizing the person bringing the argument and not the argument itself.
If your point is that the person is likely to be ignored by his/her management, there's likely a better way to phrase it or worth adding a few words to clarify.