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Ah that's what I thought yes. Seems like the best option right now. I had a look at the groupset weights and discs add very little. For 105, apparently only 25g more. A little extra wheel weight too, for example disc Zonda is 135g heavier.
https://ccache.cc/blogs/newsroom/2019-road-groupset-weight-comparison
I'm sure with this particular bike it's the lower grade carbon that adds some weight. And it does have a threaded BB. See photo below and the spec sheet and reviews.
Super_653
Netakure
Lolo
The Tarmac SL6 with 105 hydro is a really good bike, you can find the 2019 discounted in many places. It's light if you compare it with similar bikes from other brands, but going from rims to discs will add about a kilo.
The BB is not threaded, only decent ones I can think of is Bowman palace disc and Trek emonda ALR, but these are alloy frames.