IMO: I think you will find the statements are not strictly accurate?
€500 banknote remains legal tender and will always retain FACE value
That missing word makes a difference!
In view of the international role of the euro and the widespread trust in its banknotes, the €500 will remain legal tender and can therefore continue to be used as a means of payment and store of value.
Misleading! Legal tender/means of payment agreed but ‘store of value’ definitely not. The note is a currency, specifically fiat currency, which means ‘Intrinsically valueless money used as money because of government decree.’ In other words it retains its face value .... not its intrinsic value i.e. purchasing power. It is only money by decree and can be used to settle taxes i.e. it’s Legal Tender. Money has intrinsic value ..... currency does not.
The €500 banknote, like the other denominations of euro banknotes, will always retain its value.......
Again misleading! As above, it retains its face value, it will always be worth €500 but its purchasing power declines over time. The same applies to all currencies, the intrinsic value of the note (IOU) varies.