Does anyone play Ambra?

Prompted by another post, I looked up BridgewithDan’s summary of Garozzo’s Ambra system

Here are two extracts:

Snip 1:

1 - 1 = 4+ 5+ HCP

-  1nt = 5/12 HCP with maximum 2

- 2 = a) RELAY GF generally with 4+

b) 6+ 9/11 HCP

- 2= a) 5+ GF

b) 3/4 3/7 HCP

- 2 = 3/4 8/10 HCP if with 4 then MAX and 4-3-3-3

- 2 = 6+ GF

- 2nt = 4+ GF+

INTERFERENCE IN 2nd POSITION

CASE A : Opponent doubles

1 - X - XX = 4+

- 1 = 8/10 BAL or BAL GI+

- 1nt = 5+

- 2 = 5+

- 2 = 3/4 8/10 HCP

- 2 = 3 3/7 HCP

- 2 = 6+ GF+

- 2nt = 4+ GF+

Snip 2:

1 - 1nt = 5/12 HCP

- 2 = a) GF+ with 3+

b) 6+ 9/11 HCP

- 2= a) 5+ 10+ HCP

b) 6+ 8/10 HCP

- 2 =a) 5+ GF+

b) 3/4 3/7 HCP

c) 6+ 9/11 HCP

- 2 =3/4 8/10 HCP no SGL

- 2nt = 4+ GF+

INTERFERENCE IN 2nd POSITION

CASE A : Opponent doubles

1 - X - XX = 10+ HCP bal forcing to at least 2nt

- 1nt = 5+

- 2 = 5+

- 2 = 5+

- 2 = 3/4 8/10 HCP

- 2 = 3/4 3/7 HCP

- 2nt = 4+ GF+

Can anybody explain why the 2M-1 and 2M responses should switch ranges after a Double? It just looks like a memory trap to me. Or is it simply a mistake in the write-up?