Data Point:
I also recently purchased the Bose 45 headphones for $199 on a day that Rakuten was offering 15X.
Initially no points were added to my account, but that has been my experience with Dell - each time I place a Dell order when Rakuten is offering 10x or greater the points never automatically post to my account. I reached out to Rakuten customer service, included a copy of the order shipment confirmation and the correct number of points were added to my account with 24 hours.