The F-15 is an air superiority fighter

The F-15EX, the only one for which the production line is still open, is very much a multirole fighter, developed from the Strike Eagle bomber. Sure it can do air superiority, but it can carry a shitton of weapons to strike ground targets just the same.

But you're right, this is a long term order, which won't have impact on the current situation in Gaza. Additionally, it's a request that was initiated over a year ago, long before the whole situation in Gaza escalated: https://breakingdefense.com/2023/01/israel-formally-requests-25-f-15-ex-from-the-us-sources/