OP was clearly talking about team size and change velocity, not code size.
5 contributors, with over 70% from a single person is indeed small.
That’s totally fair, but insofar as the number of commits matters at all, the number sited in the grandparent post for total commits is deceptive. It’s a fraction of the number of commits that team makes.
[0] https://www.sqlite.org/testing.html