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Was the email really sent to 15.000 Intel employees?
I'm not sure why it would be feared that the media would be even interested in having lots of Intel Oregon employees talk to them. One or two maybe but 1 % would make 150 statements and I don't remember any cases offhand in which the media have published statements from 150 colleagues.
Most of the Oregon Intel employees would have never heard of Kyron Horman until he got in the news and they may not know Kaine Horman from Adam either, so they wouldn't have anything of interest to say anyway, beyond the usual "it was horrifying to hear of the disappearance and how awful the family must feel and I hope the case is solved fast". I don't think it would sell any magazines, to be honest, and it would hardly help or hinder the investigation, IMO, but maybe it would keep Kyron's face in the news. His closest coworkers might have something newsworthy to add if he's told them things about his family but for the most part the Intel employees wouldn't know anything that interests the media and people wouldn't bother to interview them in masses.
If Kyron's father had been involved in something scandalous in the workplace that everybody knew about he might have been fearful that it got out, but if that were the case I don't think an email would be enough to shut up 15.000 people; it just takes one to let the cat out of the bag, and in addition to the Intel employees he'd have had to silence all their partners and friends who they had gossiped with, and likely someone wouldn't have got the message and would have talked to the media by now.
I don't know but I think the message may have been intended to his coworkers and people who know him to tell them not to give any statements about what he's like to work with etc, and just been sent as a group email for convenience. I'm sure a shocked father has better things to do than to hunt email addresses and couldn't be sure not to leave anyone important out.
Also, I thought that the part about I am Kyron's father might be intended to let the people in his company know that yes, the KH in the news is really the same KH who works here, and make them more understanding if the personal crisis interferes with the prompt performance of his job duties somehow.