This assertion is a pedantic to the point of not even being meaningfully true.
"A decade" is ten years. Literally any ten. "The decade" colloquially refers to, you know, the decades as we refer to them. The '80s, the '90s, etc.
I know we all had fun 20 years ago being smug about the actual end of the 20th century being 2001, and you're right that technically "the 202nd decade" doesn't end for another year, but since literally no one has ever referred to the time we're living in as the 202nd decade, you're arguing with a person who doesn't actually exist.
Edit- I've never gotten silver on a comment that was in the negative before.
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u/scotlynhatt Dec 13 '19
I think the decade technically ends next year but it is a great shot. Last of the 2010s.