He’s probably referring to highly-absorbed jhana, as described, for example, in the Visuddhimagga, and taught by teachers such as Pa Auk Sayadaw. Sometimes these are referred to as “visudhimagga jhana” as opposed to “sutta jhana” for the less-absorbed versions. However, teachers such as Vens Brahm, @Sujato, and others also teach highly-absorbed jhanas, basing their interpretation on the suttas, and, as @Bhante_Darma notes, Ven Vimalaramsi seems to be at the ultra-light end of the “sutta jhana” spectrum.
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