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Hi Clint,
In the webinar video, Marco is cutting the buds off of the fruiting cane. To ensure that only your desired positions bud you can do this with a cane pruning strategy because as Tom does mention you will not necessary return to those positions as a new cane will be used every season.
If you are wanting to create a Cordon arm I would not recommend “blinding” the buds as this will cause dieback and harm to your permanent structure. I would rather remove the unwanted shoots coming from underneath during the Spring suckering/shoot thinning time while leaving the basal buds to prevent any large wounds on your permanent structure.
Hope this helps and makes sense?