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Well there's one of your problems!
Anyways, poking around that page leads to the ArcGIS REST endpoint for that address points layer: link. This can be added straight in Pro for analysis or data extraction, or you can add that whole MapService as an item in your portal for a convenient proxy. Personally I'd export the data in Pro to a copy you control to avoid battering their servers, but if you have minimal usage and need timely data you can just talk to their service as needed.
Once you have the service in whatever shape you prefer, you can add it to maps with, say, no symbol and a house number label that only shows up at large scales (i.e. max zoom). Then you can reference that layer in any Experience Builder widget that supports querying or filtering layers and you're done. If you need a more custom implementation, dig through the appropriate API references, almost every ArcGIS API has ways to deal with map service layers. If you need fuzzy address matching, dig into building a custom locator and then use that service instead.
