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Keanu Reeves prepared with Aaron Cohen for the sequel of John Wick movie. Aaron Cohen is a previous member of an Israeli special operations unit. He has been preparing Keanu on profound camouflage gun draws and AR-15 control. You can see a portion of the IDF preparing in Aaron’s lessons. The “straddle a fat horse” position is extremely clear.
In the video you can see Keanu reliably staying his left hand inside his pocket. This is to help in recovering the gun from profound concealment. With regards to seeing Keanu making the moves, it looks somewhat odd and ungainly to me. Obviously this may not be the last item and the video could be some of his prior runs.