The key word is "traditional" and they were in a unique position in that they had an incredibly unique product that was effectively a totally new type of product entirely. There were other "electric vehicles" on the market but they were incredibly lame, and slow.
Coming in with a super sporty, and quick roadster was like nothing anyone had seen before. Then they had years of "we'll have a sporty and still-cool sedan soon" being talked about on forums and video sites.
It was all enough to sustain via word of mouth.
The state of the EV market is far different now. Everybody and their dog has at least one EV model. It's no longer an entirely new and novel concept. Lucid has spent years trying to let word of mouth work, and it was almost successful, but it's not enough by itself any more.
Obviously, they still need to execute on reliability, software, and service, but they need this advertising to and I for one am glad to see signs that they are executing that part well finally.