There are those who'll defend Dr.TH's inability to pronounce things as being outside his area of expertise. However, he was portrayed (by himself and by JB) as an expert in a variety of disciplines - and was testifying under oath in a manner, as he knew, that would determine how justice for a murdered child was meted out by law
So whilst excuses might be attempted on Dr. TH's behalf by some - what the jury will remember (because they will identify) was the 'expert's' inability to pronounce the names of 'scientific stuff ' (which many jury members may well be conversant with and well able to pronounce)
Dr. TH might have believed he was displaying 'boyish' charm as he smiled, chuckled and stumbled over the 'big words' -- but in the eyes of the jury and general observers, he simply appeared INexpert, unqualified and a quack, imo, quite apart from the fact he was exposed by the State as an arrogant pretender -- who demonstrated conceit and preparedness to testify in areas in which he wasn't qualified, knowing as he did so that he was influencing a trial seeking justice for a child's murder
Boast and pretend at work, at home, online, by all means. But anyone who demonstrates willingness to do so in a court of law should be charged with attempt to pervert the course of justice, imo