I've seen this claim a lot, about various countries, but couldn't find any more detail on what the mechanisms of forced deindustrialisation might have been.

It's pretty typical for post-communist countries to lose their industries after being exposed to international competition, and probably even more so if you enter an open market like EU, but I wouldn't call it forced

UPD: ah, OK, they were indeed forced to privatise their industry, and it probably wasn't very competitive

you can judge policy by its outcomes, the countries that underwent neoliberal "privatisation" were deindustrialized, while countries that did not embrace neoliberal policies - managed to preserve their marquee industries and manufacturing, over time adapting and modernizing manufacturing to modern standards.