[wrsh07]

I think the PCA dimensionality reduction is non deterministic, but I say this with really low confidence

[soVeryTired]

PCA is purely deterministic (and might not give great results). My guess is this is done by t-sne or UMAP, both of which depend on a seed.

[minimaxir]

The About page explicitly says it's PCA.

PCA is fine enough to get it into 3D.