This is what TM said to me some months ago (direct quote)
"The 100/200 and even 400G OE’s sold in China are SPX revenue, which we own 85% of, but cannot consolidate in our financials because its a JV. However, they provide THE MARKET AND TECHNICAL ACCEPTANCE"
The 85% is now outdated. I suspect unless they sold a portion of spx, they wouldn't be able to use the money for poet purposes.