From my understanding and what I have read online, Block is just going to to buy whatever Intel has in the works. I'm not even sure if Intel had already manufactured any ASICs yet. Probably just buying designs, masks, or whatever Intel has on hand that will shorten their 5nm ASIC development process. Like what they said in the article, this will put Block on the map in the 5nm ASIC world much faster; meanwhile they can focus on developing the next gen 3nm ASICs.

I don't think Intel will continue to manufacture ASICs on their own, as they made it clear they've ditched the program. But if Block, as a customer, pays Intel's foundry services to fabricate more ASICs chips, I don't see why wouldn't Intel make them (provided that they have the capacity to take the job).