If you're doing VPSes, then maybe, as long as they're not under the same node. If it's dedicated servers, then probably.

But I think "redundancy" is more like a spectrum, rather than a binary thing. You can be more or less redundant, even within the same VPS if you'd like, but that of course be less redundant than hosting things across multiple data centers.

But that question remains the same whether you are renting bare metal or VMs. You can rent OVH servers located at different datacentres all over the globe, and their Cloud SLA has higher uptime guarantees than AWS (what that is worth depends on the value you place on an SLA ofc.)

So host one on OVH and one on Hetzner?