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It means the message was sent as an SMS rather than via Apple’s internet chat protocol. There’s also a whole thing that when you write with Android users, they always get green bubbles.
https://support.apple.com/en-us/105087
I guess, this could still mean that you’ve been blocked and it then tries to deliver via SMS, but I have no idea…
Ig because it says “sent as text message”
iMessage doesn’t give any indication of your blocked. It doesn’t even bother trying to resend as sms if the recipient blocks you