Yep it was always ten not X.
Good points about it being series 9 this year so what would the call it in the 9th year (2024).
Bits from Gurman on this
“In the latest edition of his "Power On" newsletter, Gurman dubs the overhauled device "Apple Watch X," similar to 2017's iPhone X that celebrated ten years of the iPhone. Since the original Apple Watch was unveiled in 2014 and launched in 2015, Gurman is unsure whether the Apple Watch X will be released in 2024 or 2025”
Apple is planning a complete revamp of the Apple Watch for the device's tenth anniversary, according to Bloomberg's Mark Gurman. In the...
www.macrumors.com