Apple would of known about the ChinaFlu since Nov/Dec19 when it started in China, having a factory there and the big name they are would have had insider info. Hence the minor updates now. No new products just speck bumps to keep things ticking along.
Apple like most US companies of no factories but of contractors like Foxconn who make the stuff.
I doubt they designed the new iPad in fall. Products often go through years of planning, testing etc and are not planned for what’s coming in half a year.