The source was the infamous "leak" list from early August 2024 that appeared on a Facebook page I follow.
The list included Slyde, Princess Python, Hypno-Hustler, Arachno-Man, Spider-Boy and Spider-Man Unlimited. Spider-Boy and Unlimited had just been teased at SDCC 2024.
We all dispelled Slyde, Princess Python and Hypno-Hustler as incorrect info, or that the list itself was garbage.
However, Hypno-Hustler showed up again on a rumor/leak list for a 2026 Spider-Man Retro Card release from Displaying Model Behavior on 4-9-25. So he's still in play.
Now Slyde might be back in play. The teased bag looks like it was lifted right out of the picture of Slyde that hmmberto posted.
So, as logic might follow, if Hypno-Hustler and Slyde are actually correct leaks, maybe Princess Python and Arachno-Man are as well.