There is no evidence that they checked him against some database with everything he said online. It sounds to me like a completely routine check.
This is standard procedure, and it is not a bad thing. If you are a border control agent and you want to assess if a businessman coming through is a security threat, you don't ask him, "Are you a security threat?" No, you ask about his work and get into his conversation. If he's honest and straightforward, you move on. If you catch a discrepancy in his story or he is oddly defensive (as it sounds was the case here), you ask some more questions to figure out what is going on.
Personally, I enjoy talking about my work. I cross a lot of borders and it can be a pleasure to converse with an agent who is honestly interested. Yes, 45 minutes to an hour would be annoying, but it isn't that terrible and in this case he may have brought it on himself, we can't know.
This is standard procedure, and it is not a bad thing. If you are a border control agent and you want to assess if a businessman coming through is a security threat, you don't ask him, "Are you a security threat?" No, you ask about his work and get into his conversation. If he's honest and straightforward, you move on. If you catch a discrepancy in his story or he is oddly defensive (as it sounds was the case here), you ask some more questions to figure out what is going on.
Personally, I enjoy talking about my work. I cross a lot of borders and it can be a pleasure to converse with an agent who is honestly interested. Yes, 45 minutes to an hour would be annoying, but it isn't that terrible and in this case he may have brought it on himself, we can't know.