There is circumstantial evidence from a user in Nigeria that was getting service and exiting via London, there is no evidence that any of the gateways in Nigeria are operational, so ISL could have played a role: https://www.reddit.com/r/Starlink/comments/wwg0nc/starlink_speed_test_in_nigeria/

Where does it mention that it was exiting via London?

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Dr. Ulrich Speidel

School of Computer Science

Room 303S.594 (City Campus)

The University of Auckland
u.speidel@auckland.ac.nz 
http://www.cs.auckland.ac.nz/~ulrich/
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