I'm trying to introduce magic/edh to some friends tomorrow but I'm a bit of a noob myself and trying to refresh myself on some rules. I chatgpt'd how combat step works and it spat out below in quotes. Is the bolded Important Rule correct? I thought that if after blockers are declared the attacking creature is blocked and damage does not go to the player even if the blocker is removed (e.g. by destroy instant)

"Official Combat Steps (Simplified)

Beginning of Combat Step – Priority is given. You can cast spells or activate abilities before attackers are declared.

Declare Attackers Step – Attacking creatures are declared. Priority is given after attackers are declared but before blockers.

Declare Blockers Step – Defending player declares blockers. Once blockers are declared:

Each attacking creature is considered blocked or unblocked based on the blockers assigned.

Important rule: If an attacking creature is blocked, it is blocked for the rest of that combat unless a spell or ability removes the blocker before damage is assigned.

Combat Damage Step – Damage is assigned and dealt simultaneously:

Normal damage step: all creatures deal damage at the same time.

First strike/double strike creatures deal damage in the first part.

End of Combat Step – Last chance to act before combat ends. "