Until/if there are mining pools for Chia, this isn't going to be worth it for most people even at this early stage. To fly solo, you're looking at a bare minimum of about 55TiB to make this worth while. If you don't have that storage available now, you're looking at a bare minimum of $1638 up front, just for 6 10TB drives (which equals 54.5TiB) and that price is continuing to climb rapidly. If you start plotting today with the 6x system in the article, it will take 30 days to fill those drives, so you're probably not going to see any wins for at least the first 3 weeks.
As for the profits, the numbers in this article are accurate as calculated but worthless as they don't account for the growth of the overall storage pool which is 100% guaranteed to continue. Try using
chiacalculator and you'll see how big of a difference adjusting for growth makes. When entering storage amounts you must
convert TB to TiB to get an accurate calculation. As mentioned about, six 10TB drives is equivalent to 54.5TiB. That's almost a 10% drop in perceived capacity.
Under the results heading there is a simple and advanced option. Simple is what this article uses, advanced tries to incorporate network growth.
Using the 54.5TiB as your pool the simplified results estimate $3390 a month or $20,340 over 6 months. If you switched to advanced, the estimate drops all the way to $6180 for
six months, or barely over $1000 a month, and don't forget to subtract out $1638 for the drives from that. The estimate over those 6 months, is for 10 Chia coins or one every 18 days. This is if you have 551 plots today. If you need a month to get there, the numbers will drop significantly more.