It shows the bias of Wall Street against Tesla. As you say, a 10% reduction is nothing new, Tesla has done it a few years ago, and will do it again. Other companies periodically do it also, yet their stock goes up - example is Cisco recently. (I've owned stock in Cisco, and own stock in Tesla.)
It is a buying opportunity in Tesla stock, and it will double in price by end of year.
GE, under Jack Welsh, had an open policy of culling the lowest performing 10% annually.