Note that the full memo is linked in the story. It contains at least one OMG IMHO (as they say on the 'tubez).
Note too (before someone reminds us that Gilmore predicted a slip to Marine IOC, that didn't happen) that the program has stayed on schedule by cutting tests...
JSF Program Ditches Tests To Protect Schedule | Defense content from Aviation Week
... but don't worry, they are doing it responsibly and in cooperation with stakeholders.
It also looks increasingly as if most of Block 4.1 will be fixes to 3F, with no new capabilities until 4.2 in 2021.