I'd assume that you can count them on your fingers if the bill is only $1000/month. That's a "reasonably" small scale migration, if not locked in on AWS services.
Agreed, we have 10 instances on AWS, but it's hard to judge the complexity of the migration just based on that because these servers vary in size, requirements, and purpose.
But all in all, yes, it is a fairly small scale migration.
Generally speaking, the number of servers has very little to do with complexity of migration or existential threat from downtime, relative to company size.
But all in all, yes, it is a fairly small scale migration.