I happened to drop in on the webresource Sales/Opportunity/Opportunity_main_system_library.js. The thing is littered with "Xrm.Page..."
I'm sure you're pointing out that the 1st party code uses deprecated api.
Using Xrm.Page in customization code is deprecated. But you don't have to worry about the provided code, which provides that it works correctly as part of the just product.
However, if any problem is caused by the presence of Xrm.Page in the provided code, you should send a Support Request and encourage correction.
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