Yes and no. This is the US forum @sidney0405 , but you can follow the links I posted below to the UK forum.
On May 12 eBay to UK sellers provided an update: We've temporarily paused UK GSP support to the US while we implement changes to reflect new US policy requirements. At the moment, we are unable to confirm when this will be back on, but as soon as we gather more information, we will let you know. Hope this helps clarifying everything.
The latest update as of May 21 (and confirmed to not have changed as of today, May 28) from eBay to UK sellers is: "Select GSP listings have begun to appear for US buyers, allowing some UK sellers to start seeing sales to the US. We will continue to work on ensuring that GSP service coverage is maximized, as customs requirements evolve. Until then, if you are not yet seeing GSP coverage for your item and wish to list items for US buyers, you can specify a shipping service to the US."
Marco from the eBay UK team said he will update sellers on this thread when there are more updates to share.