Psionic Armor differs from traditional telekinesis in that it does not require active visualization. The DNA Alternate creates a force of will around them that stops anything from reaching them. As the mind of the Alternate recognizes threats, they subconsciously exert their telekinetic powers to stop that threat from coming close enough to harm them.
There are obvious ways to bypass psionic armor. If the Alternate is unaware of the threat, their psionic armor will not stop it. Telekinesis acts on the physical body, and can work through psionic armor. The Alternate will feel their energy draining as they use their ability, and the psionic armor may eventually be overwhelmed.