The fixed effects negative binomial model revisited

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The Role of External Linkages and Gatekeepers for the Renewal and Expansion of US Cities' Knowledge Base, 1990–2004 (2015, methodology): “The model in Table 2 was estimated using both Poisson fixed effects and unconditional negative binomial regression (GUIMARÃES, 2008).”
The Al Gore effect: An Inconvenient Truth and voluntary carbon offsets (2011, background): “The results displayed in the table can be interpreted In a related paper, Guimaraes (2008) shows that the fixed effects only fully cancel out in a fixed effects negative binomial model when there is a specific functional relationship between each fixed effect and the corresponding overdispersion par”
The Impact of Double Taxation Treaties on Foreign Direct Investment: Evidence from Large Dyadic Panel Data (2009, methodology): “First, we need to include dyad-specific fixed effects, but the conditional fixed effects Poisson or Negative Binomial estimators, implemented as xtpoisson and xtnbreg in Stata, are not true fixed-effects models (Guimarães, 2008).”