Question about the land calculator on PeakMonsters

In addition to other useful and convenient tools on peakmonsters.com appeared land calculator:

It counts Production Points very well, exactly according to https://splinterlands.gitbook.io/the-secret-of-praetoria/production-points/calculation-examples.
The picture shows the data from the second example:

Example 2
The following will show how to calculate the total Production Points per hour for an example Common rarity land plot with a Common Totem and no Title or other boosts. The worker cards on the plot and their base PP contribution calculations are:
5 Max-Level Chaos Legion Regular Foil Rare cards - 1,100 PP each (base rate for max reg foil Rare)
These cards provide a total base production rate of 5,500 PP / hour. In this case, the only bonus is 10% from the Common totem which adds 550 PP (5,500 * 0.1), so the total PP / hour from this plot is 5,500 base + 550 bonus = 6,050 PP / hour.

But there is a discrepancy with the Farming Grain calculation. The calculator gives us 66 grain/hr. And according to https://splinterlands.gitbook.io/the-secret-of-praetoria/resource-production/worker-options/farming-grain for the second example:

In the second Production Points example, the total PP of the plot was 6,050 which means that that plot would produce 121 Grain per hour. The base production of the workers was 5,500 which means they would also consume 55 Grain / hour. after the 10% tax of 12.1 Grain / hour (see the Taxes section for more details) the total net Grain production rate will be 53.9 Grain / hour.

The discrepancy is significant. The calculator says 66 Grain/hr, the guidance says 53.9 Grain/hr.
Who is right?