Not OP, but you can use the BLS's CPI calculator. Their numbers are right [0]

Implying that OP is "Assuming an agenda" appears to break the HN guidelines [1]

[0] - https://data.bls.gov/cgi-bin/cpicalc.pl?cost1=25000&year1=20...

[1] - https://news.ycombinator.com/newsguidelines.html

They do not have a source. This happens on HN constantly: someone shits on the article with no basis in reality and no source, and their comment gets voted to the top and dominates the discussion.