Reading the article, no it isn't. Daniel Goleman, who also invented the term "Emotional intelligence", states you can have positive amygdala hijacks: let's say you're uproariously laughing out of control, that'd be a hijack that isn't panic related.
On the negative valenced side, it's not just a panic attack. It's more related to fight-or-flight than anxiety, though I see cases where amygdala hijack is overlapping with a panic attack.