If you read my post I didn't say they couldn't swim I just said I don't like to make them. My GTP loves to swim and frequently he swims in his water bowl, now that really surprised me to see. He can do it all.
What you just post was much more detailed than anything you have done before. You need to remember when you are giving advice, especially to somebody new in the hobby, that you need to give all the important details involved. Failing to do so could result in them following vague advice and harming their pet unintentionally.
Simple things like tub. Reading your post I and most would believe you are referring to a tub as used in a rack system but as seen in your photo you are actually referring to a bath tub.
Just because it is clear in your mind does not mean that it will be in others.