The articles you mention are specific about the use of Unity Catalog (a feature you CAN use in Databricks but don't have to). It is saying that if you use Unity, dbfs mounts will not work.

If you do not use unity, you can perfectly mount your cloud storage in dbfs.

Besides that: you can always access cloud storage without a mount. Instead of using a file path like '/mnt/datalake/...' you use 'S3://...' or 'abfss://...'

If you need Unity or not is another discussion as it has advantages but also limitations.