The last update was May-2019. I'm assuming if there were supply issues or the future of 64drive was uncertain, or if interest was lost in supporting it, there would be a new update by now.
Yeah the lack of updates sucks, but it's a complicated situation made worse during a pandemic. Plus by not taking orders, he cut off a source of income, which means paying the bills becomes a whole lot more important.
So you can be patient and wait and see, you can get your hands on an X7, or just make due for free with the new Parallel RDP renderer for emulators that's been getting hyped up, which allows for 2x bit-accurate upscaling of the N64 RDP, which is exactly what it'd look like if the N64 had such a mode.