Commenters on a TikTok video about the pie included one person who claims to be a Costco employee. According to that viewer, the glaze is made from apricot jelly.
The video creator decided they found the glaze off-putting and removed it by wiping it off. However, there’s no need as the layer adds sweetness and shine.
If this particular sheen layer isn’t appealing, it can be replaced with other delicious glazes that pair well with pumpkin pie, like caramel, chocolate ganache, or cranberry.