Finally came across a source that explains it instead of just bitching.

Welcome Park, though not necessarily the statue of Penn, has also been the site of some resentment among Native Americans. The plot had been given to the Haudenosaunee (Six Nations from the Iroquois Confederacy) in January 1755 by John Penn, William Penn’s grandson. In the 1700s, Native American groups often visited Philadelphia for diplomatic and trade meetings. They sometimes numbered in the hundreds and visited so frequently that John Penn asked the Provincial Council of Philadelphia to consider setting aside a piece of land for these gatherings. The delegations often refused to negotiate treaties until they could stand on their own ground and build a council fire.

"I anticipated a park in a natural pristine state. Like any other park, it would have trees, grass, water,” said Louise McDonald (Native name Wa’kerakátste), a Mohawk Bear Clan Mother from Akwesasne, N.Y. “I was frozen for a minute because I felt it had been choked and that it wasn’t a true representation of the original intentions of the space. It just seemed to be purposely buried with a cover-up narrative. There certainly seems to be a feeling of erasure intended to remove any spirit that would imply that we were once there.”

https://www.inquirer.com/news/william-penn-statue-philadelphia-welcome-park-removal-20240108.html

This isn’t about revisionism or denying history.