That's what they want you to believe anyway.
Remember people, this is a damage limitation exersize and has been since they got caught out.
Think about it, two people were being accused of misleading the stewards. What is the best McLaren can hope to get out of the mess?, or rather what is the least amount of damage they can incurr?? Who do you think is worth more to McLaren??? Hamilton or his team manager?? 30 years service or not, if it comes down to loosing just an "employee" or their No.1 driver + all the sponsership he brings and potentially even their engine manufacturer too who do you really believe McLaren would be asking to "take the blame"? Because trust me when I tell you someone has to take the blame otherwise McLaren are likely to be on the receiving end of even further sanctions from the FIA. They have already made statements to that possibility.
So you choose. Pay off a long term employee with a cheque big enough to see him comfortable for a long time or your No1 driver and loose millions in the process. Remember, McLaren is a business. At the end of the day, the bottom line is all that matters.