Lot's of whataboutism in that post.
I don't think anyone here is saying you should run more than you participate in skilled training. Skilled training should always take priority. However, at the highest level the margin for victory is often razor thin and with skillsets being nearly even already, supplementary work for cardio and strength will allow you to push harder than your opponent. Having a bigger gas tank built on something simple like running can be a huge advantage at any weightclass. We've all seen fights where the more skilled fighter gasses or lacks strength in certain areas and it ends up costing him/her the fight. See; BJ Penn's career. That's what happens when you only do skilled training and ignore your conditioning. His best years were during the time when Marv Marinovich was really pushing him to actually exercise outside of rolling, sparring, and hitting pads to improve his cardio.
Is running a cure all for everyone's cardio problems? No. Will it help? Yes, but with everything there's a point of diminishing returns. I do believe that running creates a strong base from which to work. If you're able to improve stroke volume and Vo2 max through a simple and effective task like running then you've opened up the doors to take your cardio a step further with things like HIIT, sprints, Tabata intervals, and overall being able to push harder during your skilled training. It's ok, you don't have to like running, but ignoring it is likely a mistake.
