I actually thought of this last night, and I think it was just that they wanted the Brellies to go bye bye on the same day that s4 was released, so they tweaked that a little bit.

They're just rounding up with that text.

They landed in reset verse in April of 2019, in season 4 its december 2024, which is like 4 months shy of April 2025 which would be their 6 year anniversary.