score:5
You will be able to through-check your luggage to Thailand. I have travelled China Eastern from Europe through Shanghai to Southeast Asia and my luggage was checked through. You can verify this by controlling your luggage receipts, i.e. they should read both PVG (Shanghai Pudong) and your final destination airport code, e.g. BKK for Bangkok.
What you read might have referred to practice in the U.S. where arriving internationally one needs to re-check one's luggage.
Upvote:1
Use Inquiry of rules for luggage claiming during the transfer on the China Eastern website to verify the information for each individual airport.
The answer depends on the airline you are flying with. For MU to MU and the code-shares (SkyTeam), you don't have to re-check your luggage, for others you do.