xSushi : 3.63% APY ?!

Hello, does someone can explain me why do your team wrote on exchange.sushi.com :

Stake your SUSHI into xSUSHI for ~15% APY

The current APY since one month is largely under 10%, actually below 5%… The reality with the lockup, is we earn nothing even if we stake 4000 sushi - my case -

False advertising is a crime in many countries. Please stop promising this return.

the ’ ~ ’ symbol means approximately; APY is a flexible range that changes according to the number of participants on the staking pool AFAIK

i think most people understand this, but they could still list the current APY instead of saying ~15%