[HMM I OFF TOURNAMENT] "Company"

Let's examine this quote:

1.4.1. You cannot buy back your dismissed heroes on the same day (i.e., use the "dismiss-buy back" tactic);
you also cannot buy heroes who died in battle, whether they are your own or your opponent's (do not confuse this with heroes who fled)!

The phrase that confuses you is: "(do not confuse this with heroes who fled)!"
However, this phrase refers to buying back your own hero who fled. Buying back any enemy hero is prohibited.
Therefore, this phrase can be broken down into several points:

• Buying back your own hero who died is prohibited.
• Buying back your own hero who fled is allowed.
• Buying back an enemy hero who died is prohibited.
• Buying back an enemy hero who fled is prohibited.

I hope I explained it clearly. :)

Good luck!