Yes. Keep reading that same Wikipedia article and you will find that groups in Gaza had independently been firing rockets against the direction of Hamas who at least by may was trying to enter into peace agreements with Israel.
Edit: to bring it back, Israel put blockade on the entire Palestinian Territories until Hamas was removed.
So to summarize -- Palestinian militants have been firing rockets from Gaza into Israel after Israel pulled out of Gaza.
As a result, Israel put a blockade on goods that can be used for military purposes from entering Gaza from Israel
The border between egypt and Gaza has NOT been controlled by Israel until after october 7. It was controlled by Egypt. As far as i understand, Egypt also restricted movement of people and goods to Gaza.
Look at the article you linked to again. It says clearly Israel put a blockade because Hamas had taken over on the territories until Hamas was taken out. In West Bank, Israel lifted the blockade after Hamas was removed.
There is a Wikipedia article on the gate. How it was under Israel control until 2005 and after it was given to Egypt with Israel cameras watching what was going in and out. And canceling any imports they deemed so. Exports were permitted by Israel but not by Egypt. So nothing was exported.