No it isn't, because @sbdpotato is reducing the total supply of SBD. That is persistent beyond the point where the buying stops.

If you take 60K STEEM and buy SBD, you may increase the price temporarily, and if you then convert it, you have removed 60K worth of SBD (roughly 10K SBD at this point) from the supply. If you continually buy SBD, convert it and repeat, as sbdpotato is doing, the amount removed from supply over time is much, much greater. Potato has already removed 10K SBD from circulation and is still going at a rate (increasing) of now several hundred per day.

It is a bold ambition but, especially if the SPS is approved, sbdpotato aims to potentially remove millions of SBD from the supply, which can dramatically change the market equilibrium. That can't be done with a little buy spike.