Is buying gold with the intention of preserving wealth and not paying zakat from pension money considered a deception against Allah's commands and thus forbidden, and is selling gold every year then buying different gold considered a deception?

If the money you inherited from your father reaches the nisab (definition) and a full year (hawl) has passed while it is in your possession, then you are obliged to pay zakat (definition). It is unlawful for you to withhold it on the pretext that you wish to keep it. The small amount of the pension does not invalidate the zakat on gold; rather, the zakat must be paid from the gold itself. It is unlawful to resort to trickery to avoid paying zakat. So, hasten to pay it with a good heart, and Allah will compensate you with something better.