It is true that there was a lack of investment of small PGMs in Russia before the conflict in Ukraine started.
Most of the funding was put into strategic or theater level precision weapons like cruise missiles. The Russians created the Zircon, Kinzhal, modernized older missiles like Kh-22, Kh-55, Oniks, mass produced the Kalibr, Kh-101 cruise missiles. They also put into service several Iskander brigades and are pretty close to having replaced all older systems. Outside of strategic and theater weapons they also put the Krasnopol laser guided artillery round into mass production. The Russians had to substitute production of the laser guidance package in the Soviet era Krasnopol which prior to 2014 was made in Ukraine.
What isn't true is that this situation did not change after the conflict started. Less than a year after the conflict started, the Russians put into use the glide kits effectively turning the dumb bombs into PGMs. The Lancet was put into mass production, Geran-2 is also widely available. They started using the LMUR. Usage of LMUR is still limited due to lack of compatible launch platforms since it is operator guided in flight and needs a control console. What is still mostly a no show is serial production of the Kh-59MK2, Kh-38, and Kh-36 Grom-E1/E2. In at least the case of the Kh-38 the missile had to be redesigned so it would fit inside the stealth weapons bays of the Su-57 while still keeping the cost down. Other programs might have had similar delays.