The 2021 Other identified ISU events is actually crystal clear in the USFS document. They link to ISU Comm 1629 (World Standings and Season's World Ranking) and if you scroll down to Section C it defines what are "other identified ISU events" in points 1.4 and 1.5:
It seems pretty clear to me that both Cranberry Cup and LPIDI fall under the "other identified ISU events" category and US Classic will as well, same with the John Nicks Pairs Challenge.
I think the issue is with the "assigned by the International Committee (IC Discipline Subcommittees)" part coming after "ISU International Events" in the document.
Cranberry Cup, LPIDI and John Nicks qualify as ISU International Events and they also meet the requirements of Communication 1629.
However, I don't know if the participation of US skaters to them goes through the USFSA International Committee process.
I wonder about this because none of them appear on USFSA International Assignments page while US Classic appears.
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