To give a very direct reply to the question, "YES", your training can be used against you.
But also keep in mind that your absence of training can also be used against you. It goes both ways.
The real danger in the OP's posting is not the suggestion that you shouldn't train. The danger in the OP's posting is the perpetuation of the thought that one should conduct their affairs in a manner that would negate only one legal theory of liability. Every law school has a class titled "Trial Advocacy." The purpose of that class is to train their students how to present cases in court, in a way that is most advantageous to their clients. Please note the object is not to give the most effective, or balanced, presentation of the case.
The agency that I retired from has defended hundreds of use-of-force cases at trial, and overall with some pretty good results, but also with some very significant losses. Nearly all of the claims involve allegations that the deputy's training was inadequate, and also that the supervision given to the involved deputy(s) was inadequate. Such claims can be very persuasive. You can never "measure" the effect of training or supervision that was never provided, and folks tend to believe that more of either would make a difference. Once a plaintiff's attorney has successfully transported the jury from the real world, into a fantasy world (where they can make-up the desired outcomes), their case becomes quite easy.
But if you try to counter that strategy by changing your conduct, you're doomed. The next case will be one where your alternative conduct becomes faulted. Then you have to change your conduct again, and pretty soon you're like the cat chasing it's own tail in your effort to control liability.
The Los Angeles Police Department recently had a shooting, and lawsuit, that exemplifies this. They also have a long history of defending suits, and where issues of training and supervision were at issue, and with a long history of allegations being made that training levels were inadequate.
Then there was a shooting involving a officer who was extremely well trained in the defensive use of handguns, and who was featured on the cover of Dillon's "Blue Press" magazine, along with an article describing her prowess with the handgun. Now here, is where that "Trial Advocacy" class kicks in. The plaintiff's attorney argued that this was an officer who was actively seeking to become involved in a shooting, as evidenced by the extreme amount of time she spent in apparent preparation for the event.
The best advice here is not to seek refuge from the latest legal attack, but rather be able to fully justify the actions that you take and to ensure that you can effectively communicate the reasons for those actions to the trier of fact.