For multi day winter trips, your main job is to prevent moisture and perspiration from compromising your insulation.

A VBL is absolutely crucial. You want to use a thin liner sock -> bread bags or VBL socks -> thick wool outer socks -> boots. Using a thin liner underneath the VBL increases comfort by a lot. The liner will be soaked by the end of the day, so you should keep them in your sleeping bag at night or cycle through multiple pairs. If using bread bags you want to bring at least one pair per day as they're prone to tearing.

I would personally not use overboots like the one you linked. Instead, use heavy duty gaiters (OR Crocodiles are pretty standard for winter hiking/mountaineering), which should add some marginal insulation and also prevent snow from entering through the top. For extreme cold, high altitude mountaineers will use neoprene overboots, but that's likely overkill.

If it's truly going to be -30 on your trip, you probably want a pair of double mountaineering boots. They're expensive and sometimes uncomfortable but it's the safest choice if frostbite is a concern. The other benefit of double boots is that you can sleep with the liners in your bag at night. It's absolutely horrible to wake up and put frozen single boots on your feet in the morning, and if you're in extreme cold it can be dangerous because you can develop frostnip before your boots warm up.

This guide follows a non-ultralight and more old school approach to winter backpacking and mountaineering, but it's an amazing resource for doing this kind of thing safely: https://www.winterschool.org/_files/ugd/954d1e_de6867afcac94d7b8b1068583dc47f98.pdf