Hey , from the clip couldn't really hear anything wrong. The Newer Engines do make some noises that will concern those whom might not be used to the Buells. As Long as you are sure all is adjusted properly Like Clutch Lever play up at the Lever perch is correct.
and the Clutch is adjusted properly ride the bike. IF the Bike shifts well and does not grind while going into or Through the gears using the Clutch Lever then you should be ok. Always Shift the XBs models of bikes with the Lever . Speed shifting is not a good thing. Smooth is fast.. (Sometimes ) the going into First Gear will clank which scares the heck out of some especially if they are not used to it. That is mostly normal.
The design of the Transmission is an Old one with very Small Changes over the last 40 years. Sometimes putting it into first Gear will be really smooth which is ok as well. Amsoil 20/60 in the Transmission is a good way to lessen the noises a little bit. .Extends the life of parts as well. I mix 3/4 of a Quart of Amsoil 75/90 Synthetic .gear fluid . TO 1/4 of a Quart of Amsoil 20/50 OR 20.60 oil and that works well.
The thicker fluid helps with noise and heat. Don't worry the 300 to 400/ plus degrees will make mush out of that fluid in about 3 to 4'000 miles .Make sure when draining the fluid on the primary to have it level as possible so all the fluid gets out. Just make sure to keep it from tipping over to the right..
A longer Video Clip will help, and if possible put it up on a Pit Stand so as to Ease into First Gear, let out on clutch and listen. The Miles on your bike Usually is way early for problems unless a prior owner or someone has adjusted something wrong and rode it a excess amount of miles ,nothing to worry about, just ride it safely. Keep checks on things and post up when can.*Jimi.