The figures I cited are for GDP per capita, which accounts for population growth. Moreover immigration should have the opposite effect of depressing per-capita GDP, because immigrants typically take lower skilled jobs, dragging overall productivity down. So if anything, the figures are artificially depressed, not inflated.
Technically you can say that they have been in a depression for the last 4 years and counting as their functional growth rate (accounting for inflation of the Euro) is negative over that period (down about 10% inflation adjusted).
That conclusion does not seem to check out just by eyeballing the charts.
https://data.worldbank.org/indicator/NY.GDP.PCAP.KD?location...
It shows a divergence from the EU back in the 2010s, but afterwards is recovering at the same pace or even faster than the EU. Could be better, but not "in shambles" either.