Does IRCC require a company to have a website or online presence to validate work experience?

I'm currently applying for Express Entry and my past work experience is with a small company that doesn't have a website or much of an online presence. I do have official document and a reference letter, work statement.

I'm a bit concerned after seeing some people receive ADR from IRCC because they couldn't verify the existence of the employer.

Has anyone had experience with this? Does IRCC require the company to have an active website or online footprint to accept the work experience? What kind of supporting documents helped in similar cases?

Thanks in advance!