ELABORATE TRAP: Sidestep, Force Blast. Perplex, but only to target an opposing character who has been knocked back this turn.

Assume that a character with the above trait wishes to use the passive KNOCKBACK from Force Blast to knock back its opponent. Said opponent is adjacent to blocking terrain with nowhere to go.

Does this count as being knocked back after resolutions?

This looks kind of complicated:
"12.6d Knockback Sequence
If knockback is caused due to the KNOCKBACK keyphrase, all affected characters are
knocked back after all applicable characters have clicked their dials due to damage taken
(but before the attack resolves). Otherwise, resolve the knockback when the effect
specifies.
A character that is knocked back is knocked back in a direct path (called the knockback
path) away from the character causing the knock back. To knock a character back, place
it into the first square along the path, and then place it into the next square along the path, etc. Continue placing the character one square at a time in squares next to each other along the knock back path a maximum of 3 squares away from its starting square unless
one of the things below occur that cause the knockback sequence to stop:
- The character is placed the 3 maximum squares or the specified number of squares.
- A character occupies the next square.
- A square of blocking terrain occupies the next square or a wall is in between the next
square (If the knockback path is diagonal, two walls along the intersection would stop
the path knockback).
- The next square would be past the edge of the map.
- The next square is a higher elevation than the current square.
- The previous square was a higher elevation."


"12.6e Knockback Prevention
Some effects may prevent a character from being knocked back. For knockback during an
attack, check for these effects before the character clicks its dial. For all other knockback, check for these effects just before knocking back the character.
Effects that prevent a character from being placed also prevent a character from being
knocked back."
(both Comprahesive rule book p. 30)

My read is, and I might e wrong, that you only not knocked back (regardless of move of not) if you giot an effect preventing knockback.