Essentially, yes you've got it right, although we call it the Extra Easy plan.
Food Optimising is what you do on any of the plans, whether it's Red, Green or Extra Easy - it's just when you follow the plans
Extra Easy means that you can eat carbs and meat in the same meal - so you can have chilli & rice, chicken stir fry with noodles, bolognese with pasta or a jacket potato, etc.
And you don't have to measure them out at any point (I remember you had to measure any meat on a green day as your B choice, and carbs on a red day as a B choice) although I'll always advise to eat the pasta, rice, noodles, etc. and eat them in moderation.
The 1/3 of veg/fruit on a plate still applies too.
My advice would be that if the Red/Green days are working for you, stick with them.
However, if you want a change and you're missing having pasta with bolognese, etc. then give them a go. The worst that could happen is that you can't get your head around it properly, in which case you switch back
I've seen plenty of people who have done red/green days for so many years, and they just can't get to grips with Extra Easy because they've been in one mindset for so long.
Does all that make sense?