It should be noted that the previous formula was from before 1983 when it was changed and it was changed because it overstated inflation. So a better headline should be, academic sour about being wrong all the time uses outdated formula to calculate higher inflation number. People are angry about inflation now because they compare prices to before the pandemic, so cumulative inflation over a longer period than one year. Also given most mortgages are 30year fixed, the change in 1983 was the correct thing to do, though it could be updated to use internet data on rents more.