Yeah. The link I posted is a followup to that story, in which the Biden campaign says those rumors are false.
You have to read more than the headline (but even the headline has a hint that this is not Biden speaking directly). The article says "Four people who regularly speak with the 77-year-old Biden told Politico that it is unlikely he would run for reelection in 2024" It's just rumors at best. More likely it's propaganda to get people to not worry about his age.
Will it? Maybe. You are making the assumption that specular reflection is better at reflecting than diffuse reflection, but that is a false assumption. It depends on the reflectivity of the wall and the mirror. A white wall can reflect more light than a mirror.