Official press releases are now posted on Lexus'
Canadian and
Global Newsrooms.
Note that those press releases only mention NX, with nary a mention of 3-row RX. A
Bloomberg via Automotive News report includes this passage:
Last week, Bloomberg reported the plant would also produce a three-row version of the RX, currently produced in Cambridge. However, (Toyota Motor Manufacturing Canada president Fred) Volf said Monday that report was inaccurate.
While I am unable to edit krew's news article, I did edit this thread's title to reflect today's announcement that
only NX, and
not RX L is to be built in Cambridge, Ontario starting in early 2022.
Given the 2nd-generation NX's expected (per Carmaker1) July 2020 start of production and 4th-quarter 2020 (2021 model year) start of sales, it seems that the first roughly 1.5 years of 2NX production will be solely Japanese-sourced.
By contrast, per
Wikipedia, Canadian production of non-hybrid 2RX began in September 2003, a scant 7 months after 2RX's February 2003 sales launch. For each year of the second and third generation RX, a small number of non-hybrid RXs were assembled in Japan.