Twitter didn't have retweets originally, they introduced a retweet feature in 2009. The "RT @twitterhandle" form started as a convention among users a year or two earlier. Twitter may have implemented their APIs in a backwards-compatible way by presenting their later implementation of retweet as such to older clients, though I'm pretty sure their internal representation of a retweet would be different.
Every time we come up with a way to implement some Twitter feature on Nostr we discover that it was implemented in exactly the same way as on Twitter.
Today I found out that, much like NIP-18 reposts, a "retweet" is a normal tweet with the full text of the thing being retweeted copied below after "RT @username".

For reference: https://twitter.com/fiatjaf/status/1655170785944674304
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