Supermicro is a fairly large player (4th largest) and they still manufacture servers. If this story were indeed true, none of these companies or any other company buy their servers. The story is simply fake news.
Wells Fargo committed millions of counts of bank fraud, yet they still exist and people buy their services.
BP destroyed a large part of the economy and ecosystem in the Gulf of Mexico, yet they still exist and people buy their products. One of their top lawyers just became Assistant Attorney General for the Department of Justice’s Environment and Natural Resources Division.
VW built millions of cars with hardware designed to fake emissions testing data, yet they still exist and people buy their services.
https://www.forbes.com/sites/afontevecchia/2012/07/16/hsbc-h...
Obviously no-one would have publicised this, so if you weren't involved you would have had no idea. The story does report that Amazon completely dropped Supermicro as a supplier following this alleged hack (that should be verifiable even if the reason given would obviously be different).