Although things may change a bit with the arrival of Apple M1 systems, the marketing mentions of VST in this context are fairly weasely.

For users, good look finding more than a couple of plugin developers that make their plugins available for (a) a Linux based system AND (b) the ARM architecture.

For developers, VST is just an SDK, and doesn't require OS support in any meaningful way. So sure, if you want to create VST(3) plugins for a Linux+ARM platform, you can do that, with or without Elk.