It doesn't ring true for me. I have a blog and posted their information showing half of their budget went to some 20 or 30 groups on the north coast, all of which are opposed. I can't find one single organization that they fund that is in favour of the pipeline. They funded the Dogwood Initiative, which led the campaign for a federal ban on tanker traffic. They've taken off their website their advertising for the Pipe up Against Enbridge campaign. There are many examples, not to mention that they have received nearly $1 million from the Oak Foundation, and $2 million from the William and Flora Hewlett Foundation. The Hewlett Foundation is specifically funding a campaign to reduce fossil fuel development.
I don't know why Hewlett, Oak, and other foundations would be funding Tides Canada if it had no position on the oil sands. It just doesn't make sense.