If it is a marking out table it is most likely ductile iron so that is okay.
The problem with using a hand saw with one of those blades is the speed. Even with carbide tips you have to go slow on cast iron. Part of the problem is that if the cast iron gets red hot, which it can do in a small region right at the cut when the blade is running too fast, it chills quickly due to the large bulk of material behind. The procedure for making white cast iron is to chill it from a high temperature so guess what you finish up trying to cut when you go too fast. Actually things can go downhill very fast and you may end up with fragments of blade welded into the cut and other fragments located in other areas; sometimes the other areas hurt.
Seriously; I think trying to cut it with a hand saw using any blade is approaching white coated men madness.
Cruiser's router idea is quite sane provided you can get the speed down into the less than 1000 rpm region.
Before I had looked at your link I wondered if it was a Sawz-All. This tyoe of thing:
With a bimetal blade you may be able to do it provided you control the blade speed. The Milwaukee unit pictured has a speed preset so you can avoid going to fast and is quite a good unit. (I am biased, I have one
) It is not cheap.