I don't think the video refutes Bergman on his plan to use the can at Don Carlos, but the video apparently doesn't show him heading for Don Carlos.
The relevant part of Bergman's written statement:
When I arrived at Twin Peaks, I parked my bike and when I saw how crowded Twin Peaks was I decided to use the restroom at the Don Carlos restaurant. Just as I started toward Don Carlos I heard shooting and ducked behind some cars. ...
mac_truck's remark, "He [Bergman] was clearly lying when he said he was on his way to Don Carlos when the shooting broke out." should be read in light of what Bergman actually said.
This does not state he even got a step in that direction.
Any assertion that the statement was false would have to come from a mind reader or someone speculating. The burden of proof remains with the accuser, and cannot be met from the statement presented.