That estimate is incorrect we are already at 2.23 T difficulty and looks like we are probably going to add another 15%. Looks like it should change in 17 hours or so. I used to trust the numbers at btc.com but not sure I do at this point, they have been having some issues lately.
I'm hoping for 16% or less increase at this point by tonight's adjustment. A lot of hashrate was pointed other places and/or shut down yesterday to stop the pace from reaching a 20%+ increase. I was already hoping for it to slow down from this last 15% increase but a ton of power and machines have been pointing at BTC the whole time, since all coins have been down in price and there wasn't anywhere else to go this past 10-12 days for SHA-256.