Those suggestions are insufficient.
Parents need to ask very pointed questions.
Ask to see credentials then confirm they are legitimate.
Check with the state licensing agency to confirm that they are licensed and monitored. Ask if any complaints have been filed or if they have been cited for violations of regulations.
Any accidents, physical/sexual assaults, deaths?
Question blanket policies such as severing contact between parent and child for any length of time- totally unnecessary with ethical, evidence-based therapy.
Ask for a copy of the contract, policies, and parent manual. Have them reviewed by an attorney and psychologists.
Talk to parents on Fornits and other sites about their actual experience.
Talk to survivors about the same.
Research Synanon, est/Lifespring, CEDU method and determine if you are willing to allow your child to be exposed to 'experimental' treatment.
Do not take what's stated on the website or what they tell you at face value. For your child's sake, one must do due diligence.
That's for starters.