Replacing vintage bike tyres I have a 1980 Peugeot road bike and the tyres need replacing.

The existing tyres say:
700 x 25c
25-622

Which I thought was pretty standard?

Someone in the Decathlon bike shop told me this was niche and I would struggle replacing them. He said my options were to hunt for vintage parts or go all in and get new wheels.

Is that right? I'd obviously prefer to just get new tyres if I can!

I'd really appreciate any advice!
No, that person was confused and you have it right. A new 700x25 tire will fit the same as what you have. Often 40 year old wheels will need new rim strips while you're at it.