Not sure about the Jepps as our company doesn't use them, but it's most definitely still a requirement. You can find the Japanese AIP online here
https://aisjapan.mlit.go.jp/Login.do it's free, you just need to create an account.
To save you the trouble, here's an extract from section ENR1 GENERAL RULES AND PROCEDURES:
8. Aircraft Speed Limitation
Any aircraft shall not be operated at an indicated airspeed of more
than
a) At or below 900m(3,000 ft) above MSL within control zone;
1) in the case of a reciprocating engine aircraft, 160 knots;
or
2) In the case of a turbine-powered aircraft, 200 knots
b) Above 900m (3,000ft) above MSL within control zone, or at
or below 3,000m (10,000ft) above mean sea level within a
approach control area, 250 knots
However if aircraft is instructed by ATC to be operated at a
greater airspeed than the maximum airspeed prescribed
above, the aircraft may be operated at that airspeed, or the
minimum safe airspeed to ensure safe operation is greater
than the maximum airspeed prescribed above, the aircraft
may be operated at that minimum safe airspeed. Above
provisions may not be applied if a permission is obtained
from the Minister of Land, Infrastructure, Transport and
Tourism.