The decade finishes at the end of next year.
Technically and mathematically yes (there's no year 0) but footy wise no (according to the OP article which ranges from 2010-19 rather than 2011-2020). Our 1980 premiership is classed as the first of the 80s for instance.
ps. We're not getting into the Derryn Hinch style complaint about the correct date for the start of this millennium which was celebrated on Jan 1, 2000 instead of Jan 1, 2001
.