Path of Building - How to calculate Multistrike and Close Combat?

I've seen in a build that the creator put the following lines on a jewel and said that it is because PoB doesn't calculate it and it needs to be manually input.
the lines:

\\Close Combat
59% more Melee Damage
10% increased Melee Damage
\\Multistrike
44% more Melee Attack Speed
10% more Damage
10% increased Melee Physical Damage

Is this correct? I tried searching online with no luck. when I paste these lines on a single jewel my DPS increases by around x3 times which feels a bit wrong. Can I get a confirmation?
And if it is correct, do I need to disable the support gems or keep them enabled? (Close Combat will have no effect but Multistrike will change some stats)
Thanks in advance

The way this guy has added the gems manually, you have to disable them in your link to get the correct read, as he has included everything, including quality. It looks fairly correct.

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Phrazz wrote:

The way this guy has added the gems manually, you have to disable them in your link to get the correct read, as he has included everything, including quality. It looks fairly correct.

Got it, thanks for responding :D