Communicator, for you to assert intentional waste of search time and assets, by someone in the Malaysian circle involved in this, you can't just leaved it hanging there.
Another poster (D.S.) pointed out long ago that Malaysia was aware of the primary radar track on Day 1 - they referred to contact with MH370 having been lost at 2:40 am. This is the time when the aircraft went beyond the reach of primary radar.
As to what may have motivated the Malaysians subsequently to deny the existence of the primary radar information from their own radar, it is indeed difficult to think of any political rationale that makes remote sense even by their own lights.
Most likely, there was internal wrangling between military and civilian authorities within Malaysia and/or a misguided and ultimately counterproductive attempt to portray MH370 as a routine, "nothing-to-see-here" crash.