“In War Thunder, we want to include vehicles that were complete and built; either in full, in the prototype phase or in the experimental phase. Much like the removed German ground vehicles in 2019, the three R2Y2 aircraft are unhistorical “paper” vehicles that were never built in any capacity, added in 2014 to fill a gap due to the severe lack of possible aircraft available for Japan at the time.”
Soon? In 2022 the War Thunder dev said they have plans to remove r2y2 but only remove it in 2025. They have yet to say they have plans to remove the ho ri. So you might need to wait several more years if they actually consider to do it.