Steve Jobs famously believed he could remove mucus from his body, which caused him to stink. No mucus, no body odor. His entire life, when people told him he stinks, he would reply that wasn’t possible because he removed that which caused body odor.
I’m certainly no desktop developer, but I would imagine a native application gives you access to more intrusive data than a browser, especially considering modern browser protections. Just a theory though
The court could clear the schedule for the day, insisting he go because he was invited, and he still won’t so he can complain about it very publicly. He has no desire to go at all beyond what publicity he can drum up by insisting he can’t. That’s just the way his twisted mind works