“Did the NYT really say millenniums?”
“Millenniums” is not incorrect, but “millennia” is preferred as the plural of “millennium.”
Most likely more people would understand the meaning of “millenniums” than “millennia”, and I suspect the NYT is having to gradually dumb-down their writing to keep pace with the declining IQ of their declining readership.
I’ve never seen millenniums used. It is written that way for the dummii.
[snicker]