They want to hide their paper trail of lies.From the article:

“The Times has, in the past, faced public criticisms over some of its stealth edits. In a notorious 2016 incident, the paper revised an article about then-Democratic presidential candidate Sen. Bernie Sanders, I-Vt., so drastically after publication — changing the tone from one of praise to skepticism — that it came in for a round of opprobrium from other outlets as well as the Times’s own public editor. The blogger who first noticed the revisions and set off the firestorm demonstrated the changes by using the Wayback Machine.”

https://theintercept.com/2023/09/17/new-york-times-website-internet-archive/