honestly there is no source for the article , they only say Israel believe ... , well israel may believe anything but don't forget we were producing solid fuel missile from 1987 (mushak missile) while Pakistan made hatif-1 in 1989 .(hatif-1 had 70km of range while our mushak had 160km of range) .in 1990 zelzal with 150 km of range in 1993 we had zelzal-3 with 250km of range in 2002 fath-110 and in 2008 we had ashura and sejjil , if you look till 2002 we increase the payload of the missile and in 2002 we increased the precision and then we increased the range . iit was a stage to stage program that begin before Pakistan start making solid fuel missiles.
that article suggest North Korea as supplier is a little strange because they don't have a solid fuel missile ,and honestly Russia never sold us any ballistic missile related technology we even get scud-b from Libya and N. Korea.
by the way I can't understand why people always want to find any relation between to unrelated thing .Pakistan missile program and Iranian one has no connection to each other.