I can't find the quote's context either, but consider this - why would someone ask Picasso about computers?
If the quote is correct, I wouldn't be surprised if it was in response to something like "Do you believe that computers can [be made to] create art [on their own]?". In which case the quote becomes much less categoric.
He was no computer scientist, but he presumably knew a lot about specific non-computer things. The more important those things are, the less important computers are likely to be (relative to computers, that is). So I don't think Picasso had to have known much about computers to denigrate them rationally.
But I am assuming that Picasso knew some pretty important non-computer things. And it does help to remember when he stopped being able to learn more about computers.
This is our monthly thread for collecting these little gems and pearls of wisdom, rationality-related quotes you've seen recently, or had stored in your quotesfile for ages, and which might be handy to link to in one of our discussions.