Many thanks to gvidrio1977 for sharing a short clip of Keanu on the KRGT-1 on websta. In the comment with the clip, he said that Keanu and Gard Hollinger stopped by the shop to do a sound recording. From the clip it is clear they were recording the bike. Based on the time stamp, the recording was done on August 19.
Update: Many thanks to bluerockcreative for sharing a clip on websta. this clip of Keanu on the KRGT-1 was shot from a different angle.