It's not unusual. Every brand you will see "new units" who's initial release date was years ago.
Scope makers don't "refresh" their stock continually like PC makers do. And even PC makers don't have new releases yearly.
Wrong.
And read what OP wrote, it was a false alarm. He misread dates...
If you buy Siglent from authorized dealer you won't get 4 year old scope. Period...
They sell all the stuff quickly and work hard to keep up with demand.
If they had old or used or demo scope they would sell it through their outlet and much lower price and with full disclosure..
I believe Rigol would be same.
These are not some small companies in garage. They are multimillion dollar global companies with global HQ in EU and USA. In these markets they provide support and warranty for their products on par with A brands..
And go complaint to Keysight and Tektronix, they are still selling new scopes that are based on designed released more than 10 years ago..
And that is not even a bad thing. Scopes are not gaming PCs. Good scope last year is still good scope. It is not like laws of physics about electricity changed in meantime.