StealthMarketing

Question from a reader:
I often see posts from influencers promoting apparel brands they know on social media, but many of them do not have a “PR” label. For example, a post might say, “This is my acquaintance’s brand! It’s stylish and cool, and I recommend it! Here’s the shop’s account! @〇〇△△××.” Does this fall under stealth marketing? Is the absence