This is my understanding and observations. (Don't need to prove my understanding and observations, as it's just mine and you'll be wasting ur precious time. It doesn't mean you have to agree, as it's ok to disagree)
Have to make that clear before it becomes crazy^^;
Older generations of Chinese tend to be more forgiving on the term 茶气. Most likely they can accept you are speaking in term of taste or the out of normal experience. (I fall into this, I don't mind how you use Chaqi as long as I get what you means.
The Chinese forum have a lot of after 80s netizens, some tend to be too serious and technical over things. Most just want to prove what they believe in is right. Then the debate begins and ended sour with no real answer
From my POV, it's just what type of marketing/education a person is exposed to. People who grew up with it, just assumed that is the correct standard. How many times do we buy things that people we need/must have and end up discovering we don't need that
The article is more realistic to me as it's more transparent. We use words to describe our taste and experience. Since tea is for drinking, it's closer to say it's part of taste description. So if the tea have good taste properties like good aroma, good flavor, good consistency, you can say the tea has good chaqi.
The other use of chaqi is as mentioned in that article which is in traditional Chinese medicine (TCM) properties. If the tea aids in circulation of the qi or energy in your body resulting to inner body heat increase, and/or perspiration, and/or gas begin forced out of your body. That tea is know to have strong chaqi.
So if you stand at only at the taste point, then you'll think the TCM is voodoo. If you believe too much in the value of a tea, you may think only good tea have strong chaqi because it can give you additional experience that's beyond taste.
So it really depends on the believe of the person, if the person is more open to things, you can use however you want. If the person is overzealous, just avoid the word chaqi. Unless you want a long winded "lecture" on his/her believes. Something like what I'm writing now