The nearly 4 cups of liquid that was drained off (instead of 2) must surely contain a whole lot of flavour and spicing that is simply gone. The meat mixture tastes OK this morning so I'll now go ahead and mix through the eggs and gently fry the kebabs. I'll post my opinion of the end result later.
There is no possible way that you can reduce 8 - 10 cups of liquid down to 2 over a low flame in a pan covered by a lid, even allowing for the Chana Daal to absorb some, in a time frame that would not completely destroy the meat. The evaporation - condensation reflux cycle of a covered pot would keep the fluid level high for a very long time.
There is no mention of allowing the drained meat mixture to cool. The 3 raw eggs are a binding agent and if they were whisked and added to the mixture while still hot, they would instantly cook before the kebabs are formed and this function would not occur.
I only tried this out as I had nearly 1.5 kg of frozen lamb mince and boneless rump steaks that needed to be used up. Maybe a packet mix was not the best way to go.

Finished. I doubt I'll follow this box instructions again. The resultant mass, after adding the eggs was way too wet. The individual kebabs could barely be formed at all and simply dissolved in the cooking oil. I only tried to cook 2 as I thought the egg might hold them together. It didn't. I think the whole meat mixture needed to be wrapped in muslin and wrung out like a cheese before the eggs went in.
I had to add 1
1/
2 cups of bread crumb to solidify the mix into something that could be formed and cooked. Maybe Gram Flour / Besan would have been more Indian but the crumbs did the trick. Anyway, the finished kebabs are actually quite tasty with a nice bit of chilli heat. They should be pretty good for dinner in a wrap with some fresh salad and minted cucumber raita or sour cream.