Couldn't that just be availability bias though? as in, these ads for _things_ were shown to you anyway, because there's hundreds of ads shown to you in some way

Couldn't that just be availability bias though? as in, these ads for _things_ were shown to you anyway, because there's hundreds of ads shown to you in some way or another every week and some percentage of them are for _things_, but because you were recently engaged in a conversation about _thing_, ads for _thing_ stood out in your perception enough to get past your attention filter?