No, it's completely different. Sandbagging a deposition and playing stupid games with discovery is almost standard practice. Judges hate it, opposing counsel complains bitterly, but in a pretrial civil case, out of sight of a jury, just about everyone does that on both sides.

Pleading the 5th is rather extraordinary in a civil business dispute and is not a normal tactic when you have a strong defense. It immediately raises a stink of crime for everyone concerned, and can certainly spook shareholders/investors.