I think his main point is about strict typing in Fortran. You can add type annotations in Julia but it's almost an anti-pattern if you don't need them e.g. for dispatch. In any case the type annotations in these examples would be quite unnecessary, unlike in Fortran (where as I understand you can at best enable implicit typing but then must use variable names with specific patterns).

Numerical linear algebra is the exemplar killer app for multiple dispatch; not exploiting it would be a waste.