Perhaps Moston has donned these white whiskers as a kind of disguise, so that he can carry out his covert surveys of the house without being recognised, in much the same way as an old fashioned spy would wear a false beard.
If this is the case, he should learn to keep his mouth shut. That distinctive 'miaow' is a dead giveaway.
I don't know what they teach them in cat spy schools these days.