False Positive 'Unescaped model attribute' when using safe '_html' i18n key

[jtomson]

Background

Brakeman version: 5.4.0
Rails version: 4.2.11.3
Ruby version: 2.4.10

Link to Rails application code: xxxx

False Positive

Full warning from Brakeman:

Confidence: Weak
Category: Cross-Site Scripting
Check: CrossSiteScripting
Message: Unescaped model attribute
Code: t("foo_email.description_html", :email => Foo.where(:id => params[:foo_id]).first.email)
File: app/views/foos/foo_email.html.erb
Line: 8

Relevant code:

@description = t("foo_email.description_html", :email => Foo.where(:id => params[:foo_id]).first.email)
# [... later in erb]
<div><%== @description %></div>

Using an i18n key ending in _html should automatically sanitize all parameters described in https://guides.rubyonrails.org/i18n.html#using-safe-html-translations but the use of <%== was unnecessary and good to call out?