Coolant Slightly Below The Line

I added 2 or 3 ounces of RO water to my radiator last week, just to bring the level up to the Max line. Then I realized the leftover coolant I had on hand is 50/50 mix and I could have added some of that instead.

This is the only coolant I've had to add in the last year or two, and this is of no concern right?

I just wanted to add 2-3 ounces, enough to bring it up to the max line so I can see it when I rock the car from side to side when I check it.
Some guy on a Toyota hybrid forum was trying to tell me I have a coolant leak, but I doubt I do.

When I start the car, I can smell coolant in the exhaust, and we've talked about that here in other posts. Because the car has a sensor in the muffler or something that helps send warm air to the air intake or something like that, until the engine warms up, and then I no longer smell coolant in the exhaust..

It's been a wonderful little car for me for 3.75 years now.
I'm fixing to change my oil soon, at 11 months and about 2300 miles.
I finally ran this fill of oil past the 6 month mark.
It was hard to get over the 6 month OCI habit.
With Pennzoil Platinum full synthetic 0w20, I could probably wait until Spring or even Oct 2024 and be fine.
It still makes the engine purr like a kitten.