the actors for Timon and Pumbaa both admited
Yes... all this comes from Nathan Lane and Ernie Sabella. While making the voices of Timon and Pumbaa, they decided their characters would be gay. And the voice acting
greatly influences the image of the character.
Certainly it wasn't the intention of script writers.
It's just a thing all good actors do - they think about the character they play, try to understand him, give him some personality, determine his views, his tastes and so on. As for Lane and Sabella, this idea helped them to create a very funny duet.
But - again -
there is no such thing in the script, so there's little point in speculating about it.