Is it true or I am wrongly understanding Bodhidharma?
I don't know about Bodhidharma or Zen, specifically, but I think that is inline with what you can read in or about some other "Mahayana" doctrines e.g. Wikipedia -- Arhat:
Arhat is defined in Theravada Buddhism as one who has gained insight into the true nature of existence and has achieved nirvana. Other Buddhist traditions have used the term for people far advanced along the path of Enlightenment, but who may not have reached full Buddhahood.
The understanding of the concept has changed over the centuries, and varies between different schools of Buddhism and different regions. A range of views on the attainment of arhats existed in the early Buddhist schools. The Sarvāstivāda, Kāśyapīya, Mahāsāṃghika, Ekavyāvahārika, Lokottaravāda, Bahuśrutīya, Prajñaptivāda, and Caitika schools all regarded arhats as imperfect in their attainments compared to buddhas.
Mahayana Buddhist teachings urge followers to take up the path of a bodhisattva, and to not fall back to the level of arhats and śrāvakas. The arhats, or at least the senior arhats, came to be widely regarded[by whom?] as "moving beyond the state of personal freedom to join the Bodhisattva enterprise in their own way".
See also e.g. Śrāvaka -- Mahāyāna view:
In Mahayana Buddhism, śrāvakas or arhats are sometimes contrasted negatively with bodhisattvas.
In the 4th century abhidharma work Abhidharmasamuccaya, Asaṅga describes those who follow the Śrāvakayāna. These people are described as having weak faculties, following the Śrāvaka Dharma, utilizing the Śrāvaka Piṭaka, being set on their own liberation, and cultivating detachment in order to attain liberation. Those in the Pratyekabuddhayāna are portrayed as also utilizing the Śrāvaka Piṭaka, are said to have medium faculties, to follow the Pratyekabuddha Dharma, and to be set on their own personal enlightenment. Finally, those in the Mahāyāna "Great Vehicle" are portrayed as utilizing the Bodhisattva Piṭaka, as having sharp faculties, following the Bodhisattva Dharma, and set on the perfection and liberation of all beings, and the attainment of complete enlightenment.