I agree that not inviting them is BS, but calling all those Italian teams dog turd is just disrespectful. I have to say that just inviting half of them would probably be enough from a competitive standpoint, but look at the Tour de l'Avenir when all the other nations only have national team and the French have all their regional teams.
If you split the espoir talent of any country into seventeen squads and then put them in a race against most of the best espoir teams in the world, the local teams would be dog turds. No country has seventeen teams worth of international level age group talent.
Avenir usually has three or so French teams at it, a national team and a small number of regional teams. Which means that the race isn’t majority composed of riders who are totally out of their depth. And also means that French riders are more likely to actually win the thing as a French contender is much more likely to have the 2nd, 3rd, 4th etc best French riders on their team.