We did manage to get yellow T-shirts for the playoff final in 2010… (and I know there was two weeks between semi and final)
As Mr Biscuits says, the PR own goal is as much about the lack of comment from the club as the lack of yellow merch. They are getting so many small, basic things wrong at the moment. For example, they put out a message on social media the other day reminding people that the auctions for signed shirts ended at 7pm that evening, when they actually ended at 6pm. Yes, a minor thing, but indicative of a lack of focus in the merch and comms.