[2021] Is stacking the Battle of the Monolith 10% Xp boost a bug?

Since jagex flipflops on their integrity stances and players got banned for buying keys with oddments can a j-mod confim if this is intended? Nothing on the news post about repeating for the xp reward.

If it is intentionall why not just give everyone a flat 10% xp boost after completion for the week? afking by the bank chest over and over for 5 mins is not fun or engaging.