I wouldn't count it as clinched, and I don't even care about clinching.
That's not just an irrelevant piece of an interchange. It's the connection to US-11.
Sure, it's the connection to US 11...
from I-81. It's completely irrelevant to traffic connecting between I-476 and I-81. It's basically a coincidence that you can even access US 11 from I-476. If it wasn't for the convoluted I-81/I-476 connection, there would be no access between US 11 and I-476.
With that said, the reason I'd call it clinched is because I strongly disagree with the I-476 designation extending beyond the ramps to I-81. You shouldn't need to use that section to clinch I-476, especially given the following:
(1) It's a glorified exit/entrance ramp
(2) It's only two lanes (and possibly not to interstate standards?)
(3) As mentioned, PennDOT/PTC have a direct I-476/I-81 connection in their long-term plans, which would remove the I-476 designation from this segment.