I buy the follow on effects rational, but I'm not convinced that tapes are a suitable alternative to HDDs. The random IO basically doesnt exist. But I guess if there are companies using HDDs for "cold" storage then using tape makes some sense for them.
My personal theory for this announcement is that its pure stock price manipulation. AI investing is full on fomo driven, so announce that your company is investing in X that will help AI, and watch the chuds hit buy in robinhood.