Yes, the issue you mentioned applies when using the same e-mail address. As @Martin_Bednorz told you in the other topic: It is not possible to use the same organization for GitHub and GitLab projects at the same time.
What you can try is to create another organization using a DevOps credential with a different e-mail address. If you use the same e-mail address, SonarCloud will switch you to the other DevOps credential as soon you attempt to login with it (think about it as disabling all projects from one credential to enable the ones from the current one).