Actually it looked black like the rest of the tire until I stretched it a bit. Definitely not bubblegum and pretty firmly attached, and height appears cut to match the surrounding tread. Meanwhile, the tire was definitely leaking, it was flat the day after I brought it home which is when I took a look at it and snapped that photo.
Definitely not something I expect to see on new equipment. Time to get an account on the 'lawnsite' thing I guess and give a review of the new blower. Not having done a plug of any time before I didn't know if that's what it was, someone else remarked that they thought it was a plug. I hit the trifecta of poor manufacturing (there were two other factory assembly issues) and I'm seriously unimpressed by what was supposed to be a new purchase of a premium brand. I took it back to the seller and they've supposedly fixed the issues (I haven't picked it up yet), and have put a tube in the tire.