Reddot was started some ex-crew, I recall they did a recruitment for Tiger Airways crew once but now it's been given to Sass Atlantic (the people who do the Emirates one) - so currently they don't have any links with airline recruitment teams as far as I can recall.
Things may change. No idea. A lot of these courses teach you on interviewing skills - most for profit. Some courses just teach what to wear, talk, grab attention, etc.
I didn't benefit from such courses - it's inherent within you - if it isn't - then brush up
Good luck.