A great resource for sudden stratospheric warming dates is: https://csl.noaa.gov/groups/csl8/sswcompendium/

Included is a table that list all dates back to the 1950s: https://csl.noaa.gov/groups/csl8/sswcompendium/majorevents.html

There was no major warming in 2017, but there was in February 2018.

The article is referring to the largest spike in ozone since 1979. In terms of the wind reversal itself, it's in the top 6.