Jatin,
The information you are quoting is out of date and never was intended for Flight Training. The 18 hours per week was intended for an institution of higher learning and referred to an 18 credit hour workload. The References in that web page are geared to the F-1 Visa.
The Differences between the F-1 and M-1 can be found in:
Sec. 214.3 Petitions for approval of schools.
(i) F - 1 classification. The following schools may be approved for attendance by nonimmigrant students under section 101(a)(15)(F)(i) of the Act:
(A) A college or university, i.e., an institution of higher learning which awards recognized bachelor's, master's doctor's or professional degrees.
(B) A community college or junior college which provides instruction in the liberal arts or in the professions and which awards recognized associate degrees.
(C) A seminary.
(D) A conservatory.
(E) An academic high school.
(F) An elementary school.
(G) An institution which provides language training, instruction in the liberal arts or fine arts, instruction in the professions, or instruction or training in more than one of these disciplines.
(ii) M - 1 classification. The following schools are considered to be vocational or nonacademic institutions and may be approved for attendance by nonimmigrant students under section 101(a)(15)(M)(i) of the Act:
(A) A community college or junior college which provides vocational or technical training and which awards recognized associate degrees.
(B) A vocational high school.
(C) A school which provides vocational or nonacademic training other than language training.
The INS Rules for the M-1 are here:
Sec. 214.2(m) Students in established vocational or other recognized nonacademic institutions, other than in language training programs --
This is the document which supersedes the web page you linked:
INS Proposes Significant Changes to Rules Governing Visitors and Students
And can be read the new rule making in its entirety here:
Requiring Change of Status From B to F-1 or M-1 Nonimmigrant Prior to Pursuing a Course of Study
I would also suggest that you contact your local Homeland Security Agents. I have found them to be both helpful and informative.
Take Care,
Capt. Richard J. Gentil, Pres.
Naples Air Center, Inc.