Mars in Aquarius

1
I'm wondering if many astrologers using that technique of prediction "for all signs", when transiting planet in sign interpreted as in house, counting from sign of native's Sun.
For instance, my Sun in Taurus, Mars in Aquarius, so Mars interpreted like in 10th house of career for all Tauruses since Aquarius is 10th sign from Taurus...
It said in some monthly prediction for Taurus:
"As you enter August, your career is very much on your mind. Mars, the energy planet, entered Aquarius on May 15, and in an extraordinarily long visit, is still in Aquarius and won’t leave until November 15."

2
Yes, sun sign predictions use transits as if the sign the sun is in is at the ascendant. This obviously works well for people who have sun in the first house or their ascendant is in the same sign as their sun.