Be careful with that MilSurp website and avoid their retail stores. Unquenchable gear addiction may result.

In my opinion, it would make a pretty good weapon if necessary.  Trench shovels were used as weapons quite often for hand to hand fighting in WW1.

This particular shovel is probably not my first choice of weapon. It's a bit too handle heavy and short so not a good club. It'd take some training to reliably strike with the blade with good edge alignment. It handles like a short baton or short pipe with an annoying blade on the end. The length is also not short enough to be manoeuvrable but not long enough to give much reach. It'd be much better than nothing but I just didn't feel right when I tried it as a weapon. It does look mean though.
I can wield this one-handed, and it feels okay to use this in my off hand with a knife in my dominant hand. In that mode, this spade is more for stand-off, defense and distraction while the knife does any dark deeds. That's fair because if I have the spade I'd probably also have a knife.
If I was cracking zombie skulls then I'd probably go with the spade in the dominant hand. The spade's lightness upfront means I'd want maximum power and dexterity to get that coconut cracking edge alignment. Probably a 6/10 in the weapon stakes just because it feels weird.

The photos that I see of soldiers wearing similar shovel (it's basically an Austrian variant of the M43) don't seem to holster the handle. The flopping mustn't have been all that bad.

I stay away from the MilSurp store for the same reason! When I use an old poker trick; left-pocket-right-pocket. That is, I separate out my budgeted spend and I'm only allowed to spend that.
Weapons are cool but not all that practical. I just don't see many situations where I'm going to need an armoury. But then my society has proven to pull together in a crisis. I do have my eye out for a machette though.
The current model NATO tri-folding shovel is only 630grams. It's a bit bulky though. I could lighten my black shovel by leaving the handle extension behind - there's so much weight in the handle. It'd be a bit less convenient for digging, but lighter so trade offs trade offs.
I'm trying to avoid going there to the store again or I'll come away with a Finnish Mess kit, another Hungarian Mess kit (my 5th) and the rest of my budget in MREs - which I'll eat up eating as an expensive lunch at work or something.

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It makes the shovel much better! Good for clearing vegetation from a site as well as digging and getting through roots.