I mean yea, every corporation in America knows this. When these systems were written, you could hire a dozen COBOL devs for pocket change and some string. Nowadays a single COBOL dev who can seriously work on these systems is likely to cost half a million per year.
I work in a fortune 500 company that doesn't make money from technology so it's largely immune to the current tech downturn. They've been banging on the drum of, "off the mainframe next year" for 30 years at this point. We're still using the fucking mainframe and we're still using fucking COBOL. If corporate America is struggling with something, it'd perhaps behoove the DOGE people fucking around with our technical infrastructure to stop and think, "Maybe this problem is actually much harder than we thought?"