That’s only modelling mass.
This is insufficient to reduce the injury risk in a tackle to acceptable levels.
Remember, a larger than an average male will almost certainly be stronger than average too.
While the risk conferred by mass should be smaller, remember that even very small males are stronger than very large females.
World Rugby have worked incredibly hard to model and understand the evidential base for injury risk in contact rugby, and how that can be translated to the biology of transwomen.