Is this root rot?

[Bud]

Welcome Aboard!!!!

You did a good job repotting it.
Do not worry....this kind of orchid is a survivor...it can take abuse....
wipe the leaves using cotton balls dipped in hydrogen peroxide to rule out fungi infestation...otherwise those dark spots on the leaves might be just cold water droplets burned by the sun(magnifying glass effects)
Dendrobium roots dont like being disturbed....so the next time you repot is in two years....
*tip: make sure the plant is secure and not wobbly in the pot ....use a wire clip(cut it from a thick old wire hanger, using plyers=shape it like a distended paper clip on the diameter of your pot)