Without a significant amount of needed context that quote just sounds like some awkward rambling.

Also almost every feature added to C++ adds a great deal of complexity, everything from modules, concepts, ranges, coroutines... I mean it's been 6 years since these have been standardized and all the main compilers still have major issues in terms of bugs and quality of implementation issues.

I can hardly think of any major feature added to the language that didn't introduce a great deal of footguns, unintended consequences, significant compilation performance issues... to single out contracts is unusual to say the least.