So they should wait until they die, perhaps in their 80s or 90s to pass on wealth? How does that help young people?
It's all unearned income.
You're treating this as zero sum. People should be able to keep hold of their assets, but this will disproportionately affect the poor in favour of the wealthy. Those are just the macro facts. There may be cases that are like you say, but the majorit are not.
As TSAB says, if you bought a house over 20 years ago you have effectively won the lottery - you are sitting on a fortune of unearned income. This legislation means that those who never had the opportunity to benefit from the rocket in property prices (and have already been exploited via rents to support this bubble) have to pay taxes to ensure someone gets to keep this unearned wealth. It's obscene.