If you have enough information to meet the criteria, you can submit a suggestion topic for a vehicle.
It's a different vehicle and one that was never built. It never got beyond mockup and a few parts built. As we have already explained, based on the current information, it's not viable to add and does not meet th criteria.
The tank did not exist outside of paper.
We need only compare it to the Flakpanzer 341. Which was a Panther that existed, the guns that existed but only a mockup turret and was removed from the game already for that reason.
The P.44 didn't even get to that stage, has even less information and as such there is no real chance of it coming .
Let's stay away from the conspiracy theories please and stick to facts.
There are plenty of tanks from other nations that have not been implemented that got even further and have more information than many of the vehicles you mentioned here. There is a plethora of designs based on the M103 and M48 chassis for the US, several Soviet heavy tank proposals and designs, the O-I for Japan, Strv-K for Sweden, Fv 215b 183 for the UK and many others that have not been implemented for the exact same reason as these paper / mockup Italian vehicles.