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Go watch the clip in your link. Thanks to the messed up throw, Johnson had position on Thomas and was better able to make a play on the ball. He was watching and playing the ball, while Thomas was doing neither. I know the simple assumption--and the one Andrew Joseph appears to have made--is that anytime there is contact between a receiver and defender the defender is the guilty party, but by the rules it really doesn't work that way. And since a strictly-by-the-rules hypothetical technicality is all that's being discussed anyway, what the rulebook says is all that really matters. There's a whole section on PI, which you can read here if interested: 2018 NFL Rulebook | NFL Football Operations
Johnson and Thomas are both entitled to exist on the field. As the rule is written, playing the ball (which Johnson clearly was, hence the pick) exempts you from most of the conditions that would normally trigger a PI flag. In fact, it goes on to specifically state that "contact by a player who has gained position on an opponent in an attempt to catch the ball" is permissible and does not constitute PI. There was no interference on that play, but it was much closer to being OPI than DPI.