I think the stuff I drank was brewed by the grivita brewery in Bucharest, formerly owned by Heineken. What I'm less clear about now I've looked into it more, is if it is the same beer as the Czech stuff, or they just share a name. It wasn't great either way.It's brewed just up the road from me in Plzen, it's the go-to cheap lager here. The 11, Excellent, is a smashing lager, but the 10 is really underwhelming.
It depends on when you drank it, because the brewery was sold between foreign owners in 2017. It wouldn't have been Heineken, they moved into the Czech market by buying the Krusovice brewery a few years back. Their strategy was to position Heineken as the blue ribbon brand here at the head of the Krusovice range.
I can't attest to their success, but it always seemed a longshot because most foreign beers are dismissed as over-priced and under delivering. As to the Czech contender for this particular crown, none will come close to the worst, because Carling exists. However, the Chodovar brewery has produced some shocking beers over the years. Unremarkable at the time of drinking, the next day your skull will feel three sizes too small for your brain and your stomach will behave like you knocked back a doner kebab after loading up on mutton vindaloo.
I tell thee, I was hugely disappointed to find that Heineken and carlsberg are ubiquitous in Romania. There's a few good native beers but they're crowded out by the the same strategy as Heineken you describe.
Having said that, it's the wine and spirits that are the good stuff there.