Less refrigerant used

[nike123]

Here is claim:

10.1.1 Specific features
(1) Less refrigerant charge amount due to use of double phase refrigerant flow system. The total refrigerant charge amount has been
reduced by more than 50%.

That is MHI Comercial series Heat pump non-inverter air-conditioner ceiling recessed type single split system
And here is refrigerant diagram:



Could someone explain how this works and what is function of these marked parts in this refrigeration circle in both heating and cooling mode, since I found it difficult to understand?

And this is another variance: