A device codenamed AAPJ140K1,1 appeared on Geekbench last year running macOS Mojave and the hitherto unknown Intel Core i7-8510Y. Now, a recent product change notification document has seemingly confirmed the processor's existence in along with the Core i5-8310Y.
https://www.notebookcheck.net/Intel-confirms-the-existence-of-the-Core-i7-processor-in-last-year-s-mysterious-MacBook-Air-like-device.413851.0.html
QuoteWe doubt that it will succeed the Core i5-8210Y with which Apple equipped last year's MacBook Air because Intel tends to distinguish its processors in denominations of 10 rather than 100
Wait...Intel uses a 100 denomination all the time.
i5-8250U
i5-8350U
i7-8550U
i7-8650U
etc.