Have you run over anything? These aren't to just randomly check your vehicle for damage, these are SOPs for when customers bring cars in. Also, the non-structural one is from 2018, the Model Y did not exist at that point. The depictions are of a Model 3 and they just ammended it later to include the Model Y without changing pictures. There might be changes to the Model Y belly pan since the 2018 Model 3.
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A quick scan of the parts catalog shows the outside skids (11) but there is no actual part listing for them so they are not included anymore.
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Tesla is notorious for leaving old/bad information out there so going down the rabbit hole of applying all TSBs to you and your car is a bad idea. If the car isn't operating properly, schedule service and have it taken care of, otherwise enjoy it. You will notice that none of the TNs will show up when you do the VIN search for recalls because THEY ARE NOT recalls.