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Lolo
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.