You are both correct.

Thanks a lot for the link to the official instructions.
That is what I needed. I hope that it will be useful also for others.
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This link did not work at all
http://www.runt.com.co
El RUNT es una plataforma que interactúa con multiples actores. Para acceder a la información más relevante para usted, haga clic en la opción que se ajuste a su perfil: Ciudadanos. Organismos de tránsito. Direcciones territoriales. Otros actores. Ministerio de transporte. Empresas de transporte.
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The official page clearly states "or" passport. Not "and" passport.
So passport is enough.
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Cédula de extranjería o contraseña certificada (provisionalmente) o, pasaporte vigente.
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In addition to this. I had another chat with the dealer. He contacted a friend that works as an agent in an office that handles RUNT. And that friend promised to fix my paperwork.
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Hemos conseguido un tramitador que puede ayudarnos con el proceso solo con el pasaporte. Voy a hablar con el y te confirmó.
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I have a Whatsapp message from that person that says "Claro que si"

Let's do it. I will update with how it goes.
My plan is to go to Colombia in September.

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But plans seldom seem to turn into reality for me.
Health problems, Covid19, other persons, bureaucracy, ... + a lot of things.
Soon the sky might fall down.
But until than, I keep struggling.

To avoid disappointments. My philosophy has turned into something like this:
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It's just as good to stop dreaming
It's going to hell anyway
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Take one day at a time. And do the best I can of today.