meh a lot of the mega size genome have been well known. i can think of ameoba at 200x more genome than human and a gorillion polyploid plants. Some have this has been known the last 20-30 years. Some further back. Anyone can look at some chromosomes in a microscope, no sequencing, can say if something is polyploid or not. It's a whole field, called cytobanding.

Now as far as assemblies what is interesting there, we never sequencing the human genome . What we did was sequence a lot of the human genome "except for the hard parts, seems impossible". Well in the past few years the T2T projects has successfully sequenced the whole dang thing. Just because something is "hard" or "more repetitive" don't mean ain't nothing interdasting in dere.