The meme seems to replying to those who ignore the attacks that Socialism faced and try to say that it 'naturally' is destined to fail. The meme seems to be criticism on that and reminding them of the great threats that Socialist-led states faced to still thrive.

It does not mean that we are surprised, but for others who ignore that aspect or maybe spreading such a negative image to others.

I think Socialist-led states have observed failures and made changes to survive and thrive.