Adventurism would be an undisciplined, non-tactical action by a revolutionary person or party, which doesn’t have the support of the masses and/or is too far advanced from the consciousness of the masses.

Luigi is a member of the masses and represents their revolutionary potential.

If a lone Marxist or anarchist were to try to replicate his actions without the backing of a party and a specific purpose, that would be adventurism. But Marxists should be analyzing such outbursts of energy from the masses as gauges for revolutionary potential, not as tactical errors.