Paris to Amsterdam on the Thalys Train (negative covid test?)

I have the same question!

Here are some of the websites I've been following for information on entry to Netherlands.

The official Government site:

https://www.government.nl/topics/coronavirus-covid-19/visiting-the-netherlands-from-abroad/checklist-entry/from-the-eu

Currently you'd be arriving from France which is designated as a High Risk country. The website says:

You will need to show proof of vaccination, a proof of recovery (for example a Digital COVID Certificate) or a negative COVID-19 test result
If you are travelling by air, complete a health declaration form (only when aged 12 or above)
You do not need to self-quarantine.
Do a self-test before you meet other people or go to work or school (even if you have been vaccinated).
Go to Reizentijdenscorona.nl for specific advice for your trip (in English). The travel advice tool also works if you are travelling through several countries.

I'd watch the forum and the government sites as I think the folks that live in Netherlands are expecting some changes.

BTW, I've been using this general website to figure out country to country things and they give the link to the official governmental sites for each country.

https://apply.joinsherpa.com/map

I had the same question!!! The embassy isn't clear.