Strikes are normal when politicians wants to steal pensions.

In Europe it repeats every year. Politicians try to steal pensions, workers strike, politicians back off. In America I think the workers would roll over. I wish the workers good luck and I will tolerate the temporary transport disruption if that's the cost of not being America.

Was the Eurostar delayed, does anyone know?

My experience was good: on my way in Paris -> Brussels arrived 10min early, and on my way out Brussels -> Paris I had ~15min delay (apparently because Police had to board the train before Brussels).

Eurostar was fine for me. Getting to the Eurostar within Germany apparently sucked for some. But I took a later train and didn't have issues there either.

No, I don't think Eurostar was affected at all.

Worked for me from Amsterdam.

Not for me.

Trains coming from the east via Berlin->Cologne were significantly disrupted.

As usual, there is hardly a day that doesn't happen, and it got worse this year as they finally started some repairs on critical routes, suppressing many alternatives, or average speeds.