Dgispr khwaja asif and meri jind meri jaan have reiterated the response multiple times. Any significant water rerouting will be interpreted as an act of war. Jarnal sahb also said it in more simple words “let them build the dams, once theyre ready we’ll only need to send a couple missiles” (paraphrasing)
Before we jump the gun, here's the nuance:
"The inflows and outflows at Marala were monitored on the said dates with 10,100 and 3,800 cusecs on December 9, respectively, 6,900 and 1,500 cusecs on December 10.
No outflows were monitored from Dec. 11-17, with 3,700 cusecs of inflows on Dec. 11, 3,800 on Dec. 12, 3,000 on Dec. 13, 2,000 on Dec. 14, 2,000 on Dec. 15, 1,800 on Dec. 16 and 3,800 on Dec. 17.
" - Source
So what's happening 
The inflow fluctuation can be explained by winter-season flow constriction for a snow-fed river such as Chenab, but can also be explained by engineering related "run-of-river" manipulation (in the absence of natural data) -
per the IWT India is bound to inform and explain Pakistan about the river-flow fluctuation by providing data (so it can be ascertained if it is due to natural causes or man-made, and also so Pakistan can plan timely irrigation contingencies).
India did not inform (in time) and thus Pakistan has sought clarification from them to which a response is awaited. So, Pakistan is highlighting that and labeling it "
weaponisation" and not "
violation" because India withheld the goodwill information sharing (as bounded by IWT) and
Pakistan doesn't have the evidence that India is manipulating the flow. Pakistan can not start a military action based on this since the flow-fluctuation can be
"natural" and India can come up with an excuse of not informing Pakistan in time

any military action rn will be our equivalent of Op Sindoor (military action without evidence).
It is a diplomatic issue rn over IWT that hasn't progressed to a military threshold. India is weaponizing "information" that in turn weaponizes water, and it shows their intent for the long run.
@hasssanali8998