He's proposing a hybrid model that does incorporate tiered light, cf https://doi.org/10.1093/mnras/stad2032

"While tired light (TL) models have been shown to comply with the JWST angular galaxy size data, they cannot satisfactorily explain isotropy of the cosmic microwave background (CMB) observations or fit the supernovae distance modulus vs. redshift data well. We have developed hybrid models that include the tired light concept in the expanding universe."