It is quite provocative, considering the amount of activity over compiler's codebase. Which in case of COBOL is likely very close to 0.
Both IBM Enterprise COBOL [0] and GnuCOBOL [1] are in active development, and recent releases (September 2017 for both) appear to include support for the COBOL2014 standard.
Not perhaps in the same league as more fashionable languages, but certainly a fair distance away from 'close to 0'.
[0] https://www-01.ibm.com/software/support/lifecycleapp/PLCDeta... [1] https://en.wikipedia.org/wiki/GnuCOBOL
It's analogous to saying 'A 60 year old language has better compilers than younger languages.'
Which doesn't seem especially provocative.