They can actually clone almost a full address with just maybe a two or three characters missing from it.
The only way to do that, is by creating a burn address. There's no profit for a scammer who burns the money he steals.
This is possible with vanity address generators.
Try it. Address
1FeexV6bAHb8ybZjqQMjJrcCrHGW9sb6uF holds 79,957.26462896
BTC. I'll make it easy on you: instead of 3 missing characters, try to create an address with 15 missing characters. You'll realize that what you suggested is not possible.
He may be referring to address poisoning. Where the last part may be similar to the original address. I can't remember where but I may have came across such a topic.
I knew about token burning but never knew address burning was possible. New days, new things to learn. You have any thread regarding address burning? Would appreciate very much.