Being steady state is what matters about the boivne methane production, rather than if it's natural.
Our problem isn't the steady state processes, it's the growth ones, and we won't be able to solve our growth problems by reducing the steady state ones.
It's a simple "shut up and calculate" situation, any reduction of greenhouse gasses is equally to be esteemed in proportion to the amount of forcing effect it eliminates from the atmosphere.
It's true that removing all "natural" emissions is both impractical and insufficient (I don't intend to stop exhaling!), but reduction is reduction, full stop.
Besides which, what you said is wrong on the face of it: turning the year-over-year growth in carbon emissions into a plateau is woefully insufficient to mitigate warming. Besides, we're well on track to achieve it, though some of that is due to the pandemic. We have to reduce emissions substantially below current levels, and find a way to remove carbon from the atmosphere faster than natural processes will do it for us.
In no conceivable way is drastically reducing bovine methane anything but assistance in that goal.
Our problem isn't the steady state processes, it's the growth ones, and we won't be able to solve our growth problems by reducing the steady state ones.