This is such a boring thing that people say all the time.

Lying is normal. You should be lying. Lying isn't morally wrong if it is not done for morally wrong reasons. My child should be lying to me. I should be lying to my child.

And my children will understand the difference between lying to e.g. prevent a surprise to be ruined and lying to avoid facing consequences.

It is such a black and white thinking. It is so boring too. I will teach my children violence because 1 day, they might need it too.

And sidenote: e.g. telling your child that they can "trust" the security or the police if they get lost in a large crowd, is a lie. But one that is true enough that the child is safer with them than alone in a crowd. Telling your child that e.g. a electrical signal is travelling from the tv station through a wire to your tv, would be a lie if there is some fiber cables somewhere between them, or a satellite connection. Yes, simplifications are lying. We will lie anyway to enable them to navigate the far too complex world and slowly learn about the real underlying complexities.

And obviously, there is a difference between making them write letters to Santa and telling them Santa brings gifts for Christmas.