This suggests that expensive, high-tech munitions are in very short supply on the Russian side

You can literally find a article that shits on any type of Russian weapons jfl

However, one key advantage of the JDAM-ERs is that they are "highly resistant" to "widespread" jamming in Ukraine, Hambling said.

Literally 3 months later jfl

https://old.reddit.com/r/CredibleDefense/comments/143jb0s/jamming_jdam_the_threat_to_us_munitions_from/

Here Redditors giving their expert opinion why it's actually bad for Russian to jam those JDAM's and how sanctions will soon destroy Russia economy

Kind of seems like a relatively easy R&D fix, especially moving forward as Russia's technology sector is going to be severely degraded for the foreseeable future.

Expertos

It's just prokhohols started bitching today that Russian started mass production of something Redditor told is impossible for Russia