Constraints with 3σ upper bounds vs. 95% C.L. bounds from Yang et al. (2019) (a followup of Pullen et al. (2018)) measurement at z ∼ 2.6. No [CII]-158 μm is detected at the previously tentatively reported levels; our best estimates are ∼7.5× lower, with the other 3σ upper bound at z ∼ 2.6 lower than the 95% C.L. interval. Expected 3σ sensitivity limits of two in-development surveys (Pullen et al. 2023; Bracks et al., in prep.) which will measure C+ at high R, are also shown. This tension is discussed further in the text (Section 4).