It's the only reasonable explanation why we haven't had a new ship in 4 years. The people that FDEV employeed who knew the ship code don't work there anymore and they can't figure it out.
It doesn't make sense for them to not add more ships to the game right? The simple fact is, if they add a new ship to the game for the first time in 4 years, everyone will want to try it and that means Arx sales for ship skins. It's clear they are more than capable of churning out new ship skins on a weekly basis at this point, so releasing a new ship to sell more skins is an obvious decision but they haven't done it in 4 years.
We already saw the leaks about the Panther Clipper, and Mamba Light, but there are other ships they could add like a Medium Imperial ship with a fighter bay, a Small Combat ship with 1L/2M, a Small Combat ship with 1 Huge, a Medium Combat ship with 2 Huge, a dedicated large explorer that isn't also great for combat, etc. They could even get crazy and add large ships that have rear facing Hardpoints for turrets only. There are a lot of things they could do with new ships.
But will they ever be able to figure it out?