I think numbers are representations of objects, i.e. nominally existing. In OPs vid, there's a questionmark for pi when discussing nominalism, seems to me that's easily solved by simply saying it's the ratio between the circumference of a circle to its diameter. This is not hard.
Something similar can probably be said about imaginary numbers, just more difficult than pi.
Something similar can probably be said about imaginary numbers, just more difficult than pi.