He is quite harsh on both Trenchard and Newman's approaches to etymology, and critical of their lexicons in general. He is critical of the etymology in Danker:
A few excerpts from his conclusion:Danker’s foray into etymology is not a disaster, as are those of Trenchard and Newman, but it is ill-advised. The main problem, apart from inaccuracies, is the randomness of the information given. Danker simply chooses something, without any consistent system. One can see the difficulty that he faced: to summarise in a few words a complex and highly variable body of data on each word. But one could wish he had defined his system and objective more clearly, for himself as much as for us. Part of doing so would have been to decide what purpose the etymological information serves and how it would impact on the user.
It looks as if there is a trend under way to reintroduce “etymologies” into NT lexicons. The idea has already caught on and gained momentum in less than ten years. It is likely to continue and grow in strength. There is also the likelihood, or rather certainty, that etymological material, from these three lexicons or others yet to come, will make its way into electronic resources. All this will be accompanied by the usual copying of material, of whatever quality, and without scrutiny, from one source to another, as we see already in Trenchard and Newman. Mistakes, once in the tradition, will be extremely hard to dislodge.
There is good in these lexicons, but the mistakes in them vitiate the good. If some of the etymologies cannot be trusted, then all of them must be treated with caution. The beginner simply does not have the experience to sort them out. There is however a positive suggestion with which to end. The massive etymological reference works mentioned throughout this discussion are difficult even for the experienced scholar. What we need, and have long needed, is a concise etymological dictionary of Greek, one that summarises the information in a targeted, efficient way for the non-expert. It could cover even basic derivations within Greek, as is already done in the big works, as well as the difficult questions of ultimate origin. If this challenge could be met, NT lexicographers could refer to or draw on this work and be relieved of the burden of dealing with something outside their competence.