Give it a rest with the niche bashing, OP is quite clear that he means slightly slacker but still relatively shorter travel, which is what people typically mean when they say ‘trail’.
Yeah it’s all XC at the end of the day but if he’d asked for an XC bike he’s be inundated with suggestions of light-weight carbon whippets.
Back to the point, don’t get carried away with slack on a 29er. 69deg feels pretty damned slack on a 29er. The Whyte does look interesting and if it rides anywhere near as nice as their 19 series, should be a winner!
The Trek Superfly hardtails aren’t that steep to be honest (69 – 69.6 depending on size), I’ve got a full susser Superfly and ride it as a “Trail” bike.