"it's not especially political"

Yes. Yes it is. How many times has Trump tweeted about the stock market and how it proves he is a great president? Hundreds. Literally. His NEA chair has explicitly stated "I have long believed that stock markets are the best barometer of the health, wealth and security of a nation. And today's stock market message is an unmistakable vote of confidence for the president." His entire political argument for reelection is premised on his "business acumen." His down playing of coronavirus (to what end? why?) was a blatantly partisan attempt to gamble that this whole thing would blow over rather than risk spooking the markets.

Given the impacts that the stock market crash and his handling of the virus crisis are likely to have on the election, it is definitely a political matter. Realistically any time a president comments on anything it is a political matter.