How can I know if a notification is legit?

I received a notification from @tipu. The way I see it, the account is legit. It has 1 million plus HP. Besides, as I know the account has curated my content before. However, I don't understand how the notification he sent me works. Since I could not attach a picture here on reverio.io, I will just post the link to the PeakD thread that shows two images explaining my question. 

Here is the link: https://peakd.com/hive-167922/@rzc24-nftbbg/re-leothreads-sazku5fa

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