That's hard to believe. I doubt the APG-79 can be as good as the APG-81, the Advanced Super Hornet doesn't even has an EOTS, which is important for strike missions where stealth is required.
But anyways, the ASH would be probably the last upgrade to the F/A-18 family, while the F-35C has many and many upgrades to come, just as the F/A-18 family had.
IMO, what USN should do is reduce the F-35C orders, buy more Super Hornet (or ASH) till the F/A-XX come, which is not that far.