Venari Bonesmith is one of the newest cycle of Reward card, and those are not listed on the chart you are referencing. it is not from the Beta set. for the newest Reward card cycle, as well as for Chaos Legion when it is released, the DEC burn value is half the value of the Untamed/Dice cycle of cards.

Gold Foils work slightly differently. in the past, the DEC burn value was 50 times the normal value. but now it is 25 times, so you see that the DEC burn value for the card pictured (500) is 1/4 that of an Untamed/Dice gold foil (2000). 1/2 the normal DEC burn value, time 1/2 the bonus for Gold Foil = 1/4 the expected value.

this information is outlined in a post by @splinterlands from a few months back:
@splinterlands/announcing-21-new-reward-cards