Well, Usman Ansari is also guessing
True, but he does put forth some tantalizing theories:
"Though an image released by the government’s Press Information Department appeared to show a Babur missile, its resolution was insufficient to accurately determine the missile’s identity."
"However, a naval industry official told Defense News at Pakistan’s biennial defense exhibition IDEAS 2016 in November that Pakistan was working on indigenous anti-ship missiles. This followed an earlier revelation buried in a Ministry of Defence Production report of development of a shipboard anti-ship missile launcher."
"The Babur offers the quickest route to an indigenous anti-ship missile, with a range exceeding the limitations of the Missile Technology Control Regime in the same vein as the United States' UGM/RGM-109B (TAS-M) Tomahawk."
"Though the C-602 reportedly cruises at a height of 30 meters, test-area altitude for today’s test was restricted to 1,500 meters — more akin to the higher cruise altitude of the Babur."